From f9186c97d7396402f9eeb55a6555e3c56c6082af Mon Sep 17 00:00:00 2001
From: Ikenna Omekam <ikenna@agoric.com>
Date: Fri, 17 Jan 2025 17:01:07 -0600
Subject: [PATCH 1/3] chore(eslint): upgrade to v9

---
 .eslintignore                                |   6 -
 .eslintrc.cjs                                | 288 ----------------
 eslint.config.mjs                            | 340 +++++++++++++++++++
 package.json                                 |   8 +-
 packages/cache/package.json                  |   2 +-
 packages/casting/package.json                |   2 +-
 packages/cosmic-proto/.eslintignore          |   7 -
 packages/cosmic-swingset/.eslintignore       |   6 -
 packages/cosmic-swingset/tsconfig.json       |   1 +
 packages/eslint-config/eslint-config.cjs     |   4 +-
 packages/eslint-config/package.json          |   4 +-
 packages/swingset-xsnap-supervisor/.eslintrc |   5 -
 tsconfig.json                                |   4 +-
 yarn.lock                                    | 214 ++++++------
 14 files changed, 453 insertions(+), 438 deletions(-)
 delete mode 100644 .eslintignore
 delete mode 100644 .eslintrc.cjs
 create mode 100644 eslint.config.mjs
 delete mode 100644 packages/cosmic-proto/.eslintignore
 delete mode 100644 packages/cosmic-swingset/.eslintignore
 delete mode 100644 packages/swingset-xsnap-supervisor/.eslintrc

diff --git a/.eslintignore b/.eslintignore
deleted file mode 100644
index aec808745ea..00000000000
--- a/.eslintignore
+++ /dev/null
@@ -1,6 +0,0 @@
-# also ignored in packages/cosmic-proto/.eslintignore, but IDE's pick up the root config
-packages/cosmic-proto/node_modules/
-packages/cosmic-proto/coverage/
-packages/cosmic-proto/dist/
-packages/cosmic-proto/proto/
-packages/cosmic-proto/src/codegen/
diff --git a/.eslintrc.cjs b/.eslintrc.cjs
deleted file mode 100644
index 3400a08b855..00000000000
--- a/.eslintrc.cjs
+++ /dev/null
@@ -1,288 +0,0 @@
-/* eslint-env node */
-
-const deprecatedForLoanContract = [
-  ['currency', 'brand, asset or another descriptor'],
-  ['blacklist', 'denylist'],
-  ['whitelist', 'allowlist'],
-  ['RUN', 'IST', '/RUN/'],
-];
-const allDeprecated = [...deprecatedForLoanContract, ['loan', 'debt']];
-
-const deprecatedTerminology = Object.fromEntries(
-  Object.entries({
-    all: allDeprecated,
-    loanContract: deprecatedForLoanContract,
-  }).map(([category, deprecated]) => [
-    category,
-    deprecated.flatMap(([bad, good, badRgx = `/${bad}/i`]) =>
-      [
-        ['Literal', 'value'],
-        ['TemplateElement', 'value.raw'],
-        ['Identifier', 'name'],
-      ].map(([selectorType, field]) => ({
-        selector: `${selectorType}[${field}=${badRgx}]`,
-        message: `Use '${good}' instead of deprecated '${bad}'`,
-      })),
-    ),
-  ]),
-);
-
-/**
- * Rules for code that crosses an asyncFlow membrane.
- */
-const resumable = [
-  {
-    // all async function expressions, except `onOpen` and `onClose` when they are properties of `connectionHandler`
-    selector:
-      'FunctionExpression[async=true]:not(Property[key.name="connectionHandler"] > ObjectExpression > Property[key.name=/^(onOpen|onClose)$/] > FunctionExpression[async=true])',
-    message: 'Non-immediate functions must return vows, not promises',
-  },
-  {
-    selector: 'ArrowFunctionExpression[async=true]',
-    message: 'Non-immediate functions must return vows, not promises',
-  },
-  {
-    selector: "Identifier[name='callWhen']",
-    message:
-      'callWhen wraps the function in a promise; instead immediately return a vow',
-  },
-  {
-    selector: "Identifier[name='heapVowE']",
-    message:
-      'heapVowE shortens vows to promises; instead use `E` from `@endo/far` with `watch` from durable vowTools',
-  },
-  {
-    selector: "Identifier[name='heapVowTools']",
-    message:
-      'heapVowTools are not durable; instead use `prepareVowTools` with a durable zone',
-  },
-];
-
-module.exports = {
-  root: true,
-  parser: '@typescript-eslint/parser',
-  parserOptions: {
-    useProjectService: true,
-    sourceType: 'module',
-    projectService: {
-      allowDefaultProject: ['*.js'],
-      defaultProject: 'tsconfig.json',
-    },
-    tsconfigRootDir: __dirname,
-    extraFileExtensions: ['.cjs'],
-  },
-  plugins: ['@typescript-eslint', 'prettier', 'require-extensions'],
-  extends: [
-    '@agoric',
-    'plugin:ava/recommended',
-    'plugin:require-extensions/recommended',
-  ],
-  // XXX false positive: Unused eslint-disable directive (no problems were reported from 'max-len')
-  reportUnusedDisableDirectives: true,
-
-  rules: {
-    '@typescript-eslint/no-unused-expressions': 'off', // we use `cond || Fail`
-    '@typescript-eslint/no-empty-object-type': 'warn',
-    '@typescript-eslint/no-unnecessary-type-constraint': 'warn',
-    '@typescript-eslint/no-unsafe-function-type': 'warn',
-    '@typescript-eslint/no-wrapper-object-types': 'warn',
-    '@typescript-eslint/ban-ts-comment': [
-      'error',
-      {
-        // TODO tighten to 'allow-with-description' (42 unexplained atm)
-        'ts-expect-error': false,
-        // TODO make this error (start with `src` sans codegen)
-        'ts-nocheck': false,
-      },
-    ],
-    '@typescript-eslint/no-floating-promises': 'error',
-    // so that floating-promises can be explicitly permitted with void operator
-    'no-void': ['error', { allowAsStatement: true }],
-
-    // We allow disabled tests in master
-    'ava/no-skip-test': 'off',
-    // Contrary to recommendation https://github.com/avajs/ava/blob/main/docs/recipes/typescript.md#typing-tcontext
-    'ava/use-test': 'off',
-
-    // The rule is “safe await separator" which implements the architectural
-    // goal of “clearly separate an async function's synchronous prelude from
-    // the part that runs in a future turn”. That is our architectural rule. It
-    // can be trivially satisfied by inserting a non-nested `await null` in an
-    // appropriate place to ensure the rest of the async function runs in a
-    // future turn.  “sometimes synchronous" is a bug farm for particularly
-    // pernicious bugs in which you can combine two correct pieces of code to
-    // have emergent incorrect behavior.  It’s absolutely critical for shared
-    // service code. That means contracts, but it also means kernel components
-    // that are used by multiple clients. So we enable it throughout the repo
-    // and aim for no exceptions.
-    //
-    // The default is 'warn', but we want to enforce 'error'.
-    '@jessie.js/safe-await-separator': 'error',
-
-    'jsdoc/check-tag-names': [
-      'error',
-      {
-        // TypeDoc adds tags not otherwise known to JSDoc
-        // https://typedoc.org/guides/tags/
-        definedTags: [
-          'alpha',
-          'beta',
-          'category',
-          'categoryDescription',
-          'defaultValue',
-          'document',
-          'group',
-          'groupDescription',
-          'internal',
-          'privateRemarks',
-          'remarks',
-        ],
-      },
-    ],
-
-    // CI has a separate format check but keep this warn to maintain that "eslint --fix" prettifies
-    // UNTIL https://github.com/Agoric/agoric-sdk/issues/4339
-    'prettier/prettier': 'warn',
-
-    // Not a risk with our coding style
-    'no-use-before-define': 'off',
-  },
-  settings: {
-    jsdoc: {
-      mode: 'typescript',
-    },
-  },
-  ignorePatterns: [
-    'coverage/**',
-    '**/output/**',
-    'bundles/**',
-    'bundle-*',
-    'dist/**',
-    'examples/**',
-    'test262/**',
-    '*.html',
-    'ava*.config.js',
-  ],
-  overrides: [
-    {
-      // Tighten rules for exported code.
-      files: [
-        'packages/*/src/**/*.js',
-        'packages/*/tools/**/*.js',
-        'packages/*/*.js',
-        'packages/wallet/api/src/**/*.js',
-      ],
-      rules: {
-        'no-restricted-syntax': ['error', ...deprecatedTerminology.all],
-      },
-    },
-    {
-      files: [
-        'packages/**/demo/**/*.js',
-        'packages/*/test/**/*.*s',
-        'packages/*/test/**/*.test.*s',
-        'packages/wallet/api/test/**/*.js',
-      ],
-      rules: {
-        // sometimes used for organizing logic
-        'no-lone-blocks': 'off',
-
-        // NOTE: This rule is enabled for the repository in general.  We turn it
-        // off for test code for now.
-        '@jessie.js/safe-await-separator': 'off',
-
-        // Like `'ava/no-only-test`, but works with @endo/ses-ava
-        'no-restricted-properties': [
-          'error',
-          {
-            object: 'test',
-            property: 'only',
-            message:
-              'Do not commit .only tests - they prevent other tests from running',
-          },
-        ],
-      },
-    },
-    {
-      // These tests use EV() instead of E(), which are easy to confuse.
-      // Help by erroring when E() packages are imported.
-      files: ['packages/boot/test/**/*.test.*s'],
-      rules: {
-        'no-restricted-imports': [
-          'error',
-          { paths: ['@endo/eventual-send', '@endo/far'] },
-        ],
-      },
-    },
-    {
-      // Modules with exports that must be resumable
-      files: ['packages/orchestration/src/exos/**'],
-      rules: {
-        'no-restricted-syntax': ['error', ...resumable],
-      },
-    },
-    {
-      // Allow "loan" contracts to mention the word "loan".
-      files: ['packages/zoe/src/contracts/loan/*.js'],
-      rules: {
-        'no-restricted-syntax': [
-          'error',
-          ...deprecatedTerminology.loanContract,
-        ],
-      },
-    },
-    {
-      files: ['*.ts'],
-      rules: {
-        'jsdoc/require-param-type': 'off',
-        // TS has this covered and eslint gets it wrong
-        'no-undef': 'off',
-      },
-    },
-    {
-      files: ['*.d.ts'],
-      rules: {
-        // Linter confuses the type declaration with value declaration
-        'no-redeclare': 'off',
-      },
-    },
-    {
-      // disable type-aware linting for these files that have can have a .d.ts twin
-      // because it can't go into tsconfig (because that would cause tsc build to overwrite the .d.ts twin)
-      files: ['exported.*', 'types-index.*', 'types-ambient.*', 'types.*'],
-      extends: ['plugin:@typescript-eslint/disable-type-checked'],
-    },
-    {
-      // disable type-aware linting in HTML
-      files: ['*.html'],
-      parserOptions: {
-        project: false,
-      },
-    },
-    {
-      files: ['a3p-integration/**'],
-      extends: ['plugin:@typescript-eslint/disable-type-checked'],
-      parserOptions: {
-        useProjectService: false,
-        project: false,
-      },
-      rules: {
-        '@jessie.js/safe-await-separator': 'off',
-      },
-    },
-    {
-      // Types files have no promises to lint and that linter chokes on the .d.ts twin.
-      // Maybe due to https://github.com/typescript-eslint/typescript-eslint/issues/7435
-      files: ['types*.js'],
-      rules: {
-        // Disabled to prevent:
-        //         Error: Error while loading rule '@typescript-eslint/no-floating-promises': You have used a rule which requires parserServices to be generated. You must therefore provide a value for the "parserOptions.project" property for @typescript-eslint/parser.
-        // Occurred while linting ~agoric-sdk/packages/vats/src/core/types.js
-        //     at Object.getParserServices (~agoric-sdk/node_modules/@typescript-eslint/utils/dist/eslint-utils/getParserServices.js:24:15)
-        //     at create (~agoric-sdk/node_modules/@typescript-eslint/eslint-plugin/dist/rules/no-floating-promises.js:77:31)
-        //     at Object.create (~agoric-sdk/node_modules/@typescript-eslint/utils/dist/eslint-utils/RuleCreator.js:38:20)
-        '@typescript-eslint/no-floating-promises': 'off',
-      },
-    },
-  ],
-};
diff --git a/eslint.config.mjs b/eslint.config.mjs
new file mode 100644
index 00000000000..d6502edeb04
--- /dev/null
+++ b/eslint.config.mjs
@@ -0,0 +1,340 @@
+import { fixupConfigRules, fixupPluginRules } from '@eslint/compat';
+import typescriptEslint from '@typescript-eslint/eslint-plugin';
+import prettier from 'eslint-plugin-prettier';
+import tsParser from '@typescript-eslint/parser';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import js from '@eslint/js';
+import { FlatCompat } from '@eslint/eslintrc';
+import { createRequire } from 'module';
+
+// Workaround for https://github.com/anza-xyz/eslint-plugin-require-extensions/issues/18
+const require = createRequire(import.meta.url);
+const requireExtensions = require('eslint-plugin-require-extensions');
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+});
+
+const deprecatedForLoanContract = [
+  ['currency', 'brand, asset or another descriptor'],
+  ['blacklist', 'denylist'],
+  ['whitelist', 'allowlist'],
+  ['RUN', 'IST', '/RUN/'],
+];
+
+const allDeprecated = [...deprecatedForLoanContract, ['loan', 'debt']];
+
+const deprecatedTerminology = Object.fromEntries(
+  Object.entries({
+    all: allDeprecated,
+    loanContract: deprecatedForLoanContract,
+  }).map(([category, deprecated]) => [
+    category,
+    deprecated.flatMap(([bad, good, badRgx = `/${bad}/i`]) =>
+      [
+        ['Literal', 'value'],
+        ['TemplateElement', 'value.raw'],
+        ['Identifier', 'name'],
+      ].map(([selectorType, field]) => ({
+        selector: `${selectorType}[${field}=${badRgx}]`,
+        message: `Use '${good}' instead of deprecated '${bad}'`,
+      })),
+    ),
+  ]),
+);
+
+export default [
+  {
+    ignores: [
+      '**/coverage/',
+      '**/node_modules/',
+      '**/dist/',
+      '**/output/',
+      '**/build/',
+      '**/bundles/',
+      '**/bundle-*',
+      'examples/',
+      'test262/',
+      '**/*.html',
+      '**/ava*.config.js',
+      '**/.ava*.config.js',
+      'packages/cosmic-proto/proto/',
+      'packages/cosmic-proto/src/codegen/',
+      'packages/cosmic-proto/scripts/',
+      // Cosmic-swingset specific ignores
+      'packages/cosmic-swingset/t[0-9]/',
+      'packages/cosmic-swingset/t[0-9].*/',
+      // a3p-integration specific ignores
+      'a3p-integration/agoric-sdk/',
+    ],
+  },
+  {
+    // Include both .js and .ts files for casting package
+    files: ['packages/casting/**/*.{js,ts,mjs,cjs}'],
+  },
+  {
+    // Include both .js and .ts files for cache package
+    files: ['packages/cache/**/*.{js,ts,mjs,cjs}'],
+  },
+  ...fixupConfigRules(
+    compat.extends(
+      '@agoric',
+      'plugin:ava/recommended',
+      'plugin:require-extensions/recommended',
+    ),
+  ),
+  {
+    plugins: {
+      '@typescript-eslint': typescriptEslint,
+      prettier,
+      'require-extensions': fixupPluginRules(requireExtensions),
+    },
+
+    linterOptions: {
+      reportUnusedDisableDirectives: true,
+    },
+
+    languageOptions: {
+      parser: tsParser,
+      ecmaVersion: 5,
+      sourceType: 'module',
+
+      parserOptions: {
+        useProjectService: true,
+
+        projectService: {
+          allowDefaultProject: ['*.js'],
+          defaultProject: 'tsconfig.json',
+        },
+
+        tsconfigRootDir: __dirname,
+        extraFileExtensions: ['.cjs'],
+      },
+    },
+
+    settings: {
+      jsdoc: {
+        mode: 'typescript',
+      },
+    },
+
+    rules: {
+      '@typescript-eslint/no-unused-expressions': 'off',
+      '@typescript-eslint/no-empty-object-type': 'warn',
+      '@typescript-eslint/no-unnecessary-type-constraint': 'warn',
+      '@typescript-eslint/no-unsafe-function-type': 'warn',
+      '@typescript-eslint/no-wrapper-object-types': 'warn',
+      '@typescript-eslint/ban-ts-comment': [
+        'error',
+        {
+          'ts-expect-error': false,
+          'ts-nocheck': false,
+        },
+      ],
+
+      '@typescript-eslint/no-floating-promises': 'error',
+
+      'no-void': [
+        'error',
+        {
+          allowAsStatement: true,
+        },
+      ],
+
+      'ava/no-skip-test': 'off',
+      'ava/use-test': 'off',
+      '@jessie.js/safe-await-separator': 'error',
+
+      'jsdoc/check-tag-names': [
+        'error',
+        {
+          definedTags: [
+            'alpha',
+            'beta',
+            'category',
+            'categoryDescription',
+            'defaultValue',
+            'document',
+            'group',
+            'groupDescription',
+            'internal',
+            'privateRemarks',
+            'remarks',
+          ],
+        },
+      ],
+
+      'prettier/prettier': 'warn',
+      'no-use-before-define': 'off',
+    },
+  },
+  {
+    // Tighten rules for exported code.
+    files: [
+      'packages/*/src/**/*.js',
+      'packages/*/tools/**/*.js',
+      'packages/*/*.js',
+      'packages/wallet/api/src/**/*.js',
+    ],
+
+    rules: {
+      'no-restricted-syntax': ['error', ...deprecatedTerminology.all],
+    },
+  },
+  {
+    files: [
+      'packages/**/demo/**/*.js',
+      'packages/*/test/**/*.*s',
+      'packages/*/test/**/*.test.*s',
+      'packages/wallet/api/test/**/*.js',
+    ],
+
+    rules: {
+      'no-lone-blocks': 'off',
+      '@jessie.js/safe-await-separator': 'off',
+
+      'no-restricted-properties': [
+        'error',
+        {
+          object: 'test',
+          property: 'only',
+          message:
+            'Do not commit .only tests - they prevent other tests from running',
+        },
+      ],
+    },
+  },
+  {
+    files: ['packages/boot/test/**/*.test.*s'],
+
+    rules: {
+      'no-restricted-imports': [
+        'error',
+        {
+          paths: ['@endo/eventual-send', '@endo/far'],
+        },
+      ],
+    },
+  },
+  {
+    files: ['packages/orchestration/src/exos/**'],
+
+    rules: {
+      'no-restricted-syntax': [
+        'error',
+        {
+          selector:
+            'FunctionExpression[async=true]:not(Property[key.name="connectionHandler"] > ObjectExpression > Property[key.name=/^(onOpen|onClose)$/] > FunctionExpression[async=true])',
+          message: 'Non-immediate functions must return vows, not promises',
+        },
+        {
+          selector: 'ArrowFunctionExpression[async=true]',
+          message: 'Non-immediate functions must return vows, not promises',
+        },
+        {
+          selector: "Identifier[name='callWhen']",
+          message:
+            'callWhen wraps the function in a promise; instead immediately return a vow',
+        },
+        {
+          selector: "Identifier[name='heapVowE']",
+          message:
+            'heapVowE shortens vows to promises; instead use `E` from `@endo/far` with `watch` from durable vowTools',
+        },
+        {
+          selector: "Identifier[name='heapVowTools']",
+          message:
+            'heapVowTools are not durable; instead use `prepareVowTools` with a durable zone',
+        },
+      ],
+    },
+  },
+  {
+    // Allow "loan" contracts to mention the word "loan".
+    files: ['packages/zoe/src/contracts/loan/*.js'],
+
+    rules: {
+      'no-restricted-syntax': ['error', ...deprecatedTerminology.loanContract],
+    },
+  },
+  {
+    files: ['**/*.ts'],
+
+    rules: {
+      'jsdoc/require-param-type': 'off',
+      'no-undef': 'off',
+    },
+  },
+  {
+    files: ['**/*.d.ts'],
+
+    rules: {
+      'no-redeclare': 'off',
+    },
+  },
+  ...compat
+    .extends('plugin:@typescript-eslint/disable-type-checked')
+    .map(config => ({
+      ...config,
+      files: [
+        '**/exported.*',
+        '**/types-index.*',
+        '**/types-ambient.*',
+        '**/types.*',
+      ],
+    })),
+  {
+    files: ['**/*.html'],
+
+    languageOptions: {
+      ecmaVersion: 5,
+      sourceType: 'script',
+
+      parserOptions: {
+        project: false,
+      },
+    },
+  },
+  ...compat
+    .extends('plugin:@typescript-eslint/disable-type-checked')
+    .map(config => ({
+      ...config,
+      files: ['a3p-integration/**'],
+    })),
+  {
+    files: ['a3p-integration/**'],
+
+    languageOptions: {
+      ecmaVersion: 5,
+      sourceType: 'script',
+
+      parserOptions: {
+        useProjectService: false,
+        project: false,
+      },
+    },
+
+    rules: {
+      '@jessie.js/safe-await-separator': 'off',
+    },
+  },
+  {
+    files: ['**/types*.js'],
+
+    rules: {
+      '@typescript-eslint/no-floating-promises': 'off',
+    },
+  },
+  {
+    // Rules specific to swingset-xsnap-supervisor
+    files: ['packages/swingset-xsnap-supervisor/**/*.js'],
+    rules: {
+      'import/no-extraneous-dependencies': 'off',
+    },
+  },
+];
diff --git a/package.json b/package.json
index f289a011b19..b46fd1a19de 100644
--- a/package.json
+++ b/package.json
@@ -12,13 +12,13 @@
   "devDependencies": {
     "@endo/eslint-plugin": "^2.2.3",
     "@google-cloud/monitoring": "^4.1.0",
-    "@jessie.js/eslint-plugin": "^0.4.1",
+    "@jessie.js/eslint-plugin": "^0.4.2",
     "@types/express": "^4.17.17",
     "@types/node": "^22.9.0",
     "ava": "^5.3.0",
     "c8": "^10.1.2",
     "conventional-changelog-conventionalcommits": "^4.6.0",
-    "eslint": "^8.57.1",
+    "eslint": "^9.0.0",
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-config-jessie": "^0.0.6",
     "eslint-config-prettier": "^9.1.0",
@@ -59,8 +59,8 @@
     "lerna": "lerna",
     "link-cli": "yarn run create-agoric-cli",
     "create-agoric-cli": "node ./scripts/create-agoric-cli.cjs",
-    "format": "yarn prettier --write .github golang packages scripts a3p-integration multichain-testing",
-    "lint:format": "yarn prettier --check .github golang packages scripts a3p-integration multichain-testing",
+    "format": "yarn prettier --write .github golang packages scripts a3p-integration multichain-testing eslint.config.mjs",
+    "lint:format": "yarn prettier --check .github golang packages scripts a3p-integration multichain-testing eslint.config.mjs",
     "lint-fix": "yarn lerna run --no-bail lint-fix",
     "lint": "run-s --continue-on-error lint:*",
     "lint:packages": "yarn lerna run --no-bail lint",
diff --git a/packages/cache/package.json b/packages/cache/package.json
index 4467520d79b..d7925464799 100644
--- a/packages/cache/package.json
+++ b/packages/cache/package.json
@@ -13,7 +13,7 @@
     "lint-fix": "yarn lint:eslint --fix",
     "lint": "run-s --continue-on-error lint:*",
     "lint:types": "tsc",
-    "lint:eslint": "eslint --ext .js,.ts ."
+    "lint:eslint": "eslint ."
   },
   "keywords": [],
   "author": "Agoric",
diff --git a/packages/casting/package.json b/packages/casting/package.json
index 1cc342bd405..51cf46863e2 100644
--- a/packages/casting/package.json
+++ b/packages/casting/package.json
@@ -16,7 +16,7 @@
     "lint-fix": "yarn lint:eslint --fix",
     "lint": "run-s --continue-on-error lint:*",
     "lint:types": "tsc",
-    "lint:eslint": "eslint --ext .js,.ts ."
+    "lint:eslint": "eslint ."
   },
   "keywords": [],
   "author": "Agoric",
diff --git a/packages/cosmic-proto/.eslintignore b/packages/cosmic-proto/.eslintignore
deleted file mode 100644
index 7eee12970a7..00000000000
--- a/packages/cosmic-proto/.eslintignore
+++ /dev/null
@@ -1,7 +0,0 @@
-# keep synchronized with ../../.eslintignore
-node_modules/
-coverage/
-dist/
-proto/
-# leading `**` ensures that this pattern still matches relative to project root
-**/src/codegen/
diff --git a/packages/cosmic-swingset/.eslintignore b/packages/cosmic-swingset/.eslintignore
deleted file mode 100644
index b1cd0b66a26..00000000000
--- a/packages/cosmic-swingset/.eslintignore
+++ /dev/null
@@ -1,6 +0,0 @@
-/dist
-/src/bundles/
-t[0-9]/
-node_modules/
-build/
-t[0-9].*/
diff --git a/packages/cosmic-swingset/tsconfig.json b/packages/cosmic-swingset/tsconfig.json
index a4aea10a6de..1925e9caba4 100644
--- a/packages/cosmic-swingset/tsconfig.json
+++ b/packages/cosmic-swingset/tsconfig.json
@@ -8,5 +8,6 @@
     "calc-*.js",
     "src/**/*.js",
     "test/**/*.js",
+    "*.cjs",
   ],
 }
diff --git a/packages/eslint-config/eslint-config.cjs b/packages/eslint-config/eslint-config.cjs
index eb184802d50..e2514fdc844 100644
--- a/packages/eslint-config/eslint-config.cjs
+++ b/packages/eslint-config/eslint-config.cjs
@@ -31,11 +31,13 @@ module.exports = {
     'prefer-regex-literals': 'off',
     'no-else-return': 'off',
     'no-console': 'off',
+    'no-lone-blocks': 'off',
     'no-unused-vars': [
       'error',
       {
         argsIgnorePattern: '^_',
         varsIgnorePattern: '^_',
+        caughtErrors: 'none', // Needed now that in ESLint v9.0.0, varsIgnorePattern no longer applies to errors in catch clauses
       },
     ],
     'no-inner-declarations': 'off',
@@ -49,7 +51,7 @@ module.exports = {
     'default-param-last': 'off', // unaware of TS type annotations
     'consistent-return': 'off', // unaware of throws. TS detects more reliably.
     'no-fallthrough': 'warn', // unaware of throws.
-
+    'no-redeclare': ['error', { builtinGlobals: false }], // Allow redeclaration of built-in globals when explicitly declared
     'spaced-comment': [
       'error',
       'always',
diff --git a/packages/eslint-config/package.json b/packages/eslint-config/package.json
index ffcf0f8c5a2..3daa99c8795 100644
--- a/packages/eslint-config/package.json
+++ b/packages/eslint-config/package.json
@@ -26,9 +26,9 @@
   ],
   "peerDependencies": {
     "@endo/eslint-plugin": "^2.2.3",
-    "@jessie.js/eslint-plugin": "^0.4.1",
+    "@jessie.js/eslint-plugin": "^0.4.2",
     "typescript-eslint": "^8.17.0",
-    "eslint": "^8.57.0",
+    "eslint": "^9.0.0",
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-plugin-github": "^5.1.4",
     "eslint-config-jessie": "^0.0.6",
diff --git a/packages/swingset-xsnap-supervisor/.eslintrc b/packages/swingset-xsnap-supervisor/.eslintrc
deleted file mode 100644
index 2f2f707c490..00000000000
--- a/packages/swingset-xsnap-supervisor/.eslintrc
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "rules": {
-    "import/no-extraneous-dependencies": "off"
-  }
-}
diff --git a/tsconfig.json b/tsconfig.json
index 628996edaba..142e8387c82 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -18,7 +18,7 @@
     "noEmit": true
   },
   "include": [
-    ".eslintrc.cjs",
-    "dist"
+    "eslint.config.mjs",
+    "dist",
   ]
 }
diff --git a/yarn.lock b/yarn.lock
index 7a8a1ce7d57..1a3a1bc26fd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1812,7 +1812,7 @@
   dependencies:
     eslint-visitor-keys "^3.4.3"
 
-"@eslint-community/regexpp@^4.10.0", "@eslint-community/regexpp@^4.6.1":
+"@eslint-community/regexpp@^4.10.0", "@eslint-community/regexpp@^4.12.1":
   version "4.12.1"
   resolved "https://registry.yarnpkg.com/@eslint-community/regexpp/-/regexpp-4.12.1.tgz#cfc6cffe39df390a3841cde2abccf92eaa7ae0e0"
   integrity sha512-CCZCDJuduB9OUkFkY2IgppNZMi2lBQgD2qzwXkEia16cge2pijY/aXi96CJMquDMn3nJdlPV1A5KrJEXwfLNzQ==
@@ -1822,22 +1822,23 @@
   resolved "https://registry.yarnpkg.com/@eslint/compat/-/compat-1.2.4.tgz#b69b0d76ce73fe66d7f8633c406acea151f5c559"
   integrity sha512-S8ZdQj/N69YAtuqFt7653jwcvuUj131+6qGLUyDqfDg1OIoBQ66OCuXC473YQfO2AaxITTutiRQiDwoo7ZLYyg==
 
-"@eslint/eslintrc@^2.1.4":
-  version "2.1.4"
-  resolved "https://registry.yarnpkg.com/@eslint/eslintrc/-/eslintrc-2.1.4.tgz#388a269f0f25c1b6adc317b5a2c55714894c70ad"
-  integrity sha512-269Z39MS6wVJtsoUl10L60WdkhJVdPG24Q4eZTH3nnF6lpvSShEK3wQjDX9JRWAUPvPh7COouPpU9IrqaZFvtQ==
+"@eslint/config-array@^0.19.0":
+  version "0.19.1"
+  resolved "https://registry.yarnpkg.com/@eslint/config-array/-/config-array-0.19.1.tgz#734aaea2c40be22bbb1f2a9dac687c57a6a4c984"
+  integrity sha512-fo6Mtm5mWyKjA/Chy1BYTdn5mGJoDNjC7C64ug20ADsRDGrA85bN3uK3MaKbeRkRuuIEAR5N33Jr1pbm411/PA==
   dependencies:
-    ajv "^6.12.4"
-    debug "^4.3.2"
-    espree "^9.6.0"
-    globals "^13.19.0"
-    ignore "^5.2.0"
-    import-fresh "^3.2.1"
-    js-yaml "^4.1.0"
+    "@eslint/object-schema" "^2.1.5"
+    debug "^4.3.1"
     minimatch "^3.1.2"
-    strip-json-comments "^3.1.1"
 
-"@eslint/eslintrc@^3.1.0":
+"@eslint/core@^0.10.0":
+  version "0.10.0"
+  resolved "https://registry.yarnpkg.com/@eslint/core/-/core-0.10.0.tgz#23727063c21b335f752dbb3a16450f6f9cbc9091"
+  integrity sha512-gFHJ+xBOo4G3WRlR1e/3G8A6/KZAH6zcE/hkLRCZTi/B9avAG365QhFA8uOGzTMqgTghpn7/fSnscW++dpMSAw==
+  dependencies:
+    "@types/json-schema" "^7.0.15"
+
+"@eslint/eslintrc@^3.1.0", "@eslint/eslintrc@^3.2.0":
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/@eslint/eslintrc/-/eslintrc-3.2.0.tgz#57470ac4e2e283a6bf76044d63281196e370542c"
   integrity sha512-grOjVNN8P3hjJn/eIETF1wwd12DdnwFDoyceUJLYYdkpbwq3nLi+4fqrTAONx7XDALqlL220wC/RHSC/QTI/0w==
@@ -1852,16 +1853,29 @@
     minimatch "^3.1.2"
     strip-json-comments "^3.1.1"
 
-"@eslint/js@8.57.1":
-  version "8.57.1"
-  resolved "https://registry.yarnpkg.com/@eslint/js/-/js-8.57.1.tgz#de633db3ec2ef6a3c89e2f19038063e8a122e2c2"
-  integrity sha512-d9zaMRSTIKDLhctzH12MtXvJKSSUhaHcjV+2Z+GK+EEY7XKpP5yR4x+N3TAcHTcu963nIr+TMcCb4DBCYX1z6Q==
+"@eslint/js@9.18.0":
+  version "9.18.0"
+  resolved "https://registry.yarnpkg.com/@eslint/js/-/js-9.18.0.tgz#3356f85d18ed3627ab107790b53caf7e1e3d1e84"
+  integrity sha512-fK6L7rxcq6/z+AaQMtiFTkvbHkBLNlwyRxHpKawP0x3u9+NC6MQTnFW+AdpwC6gfHTW0051cokQgtTN2FqlxQA==
 
 "@eslint/js@^9.14.0":
   version "9.16.0"
   resolved "https://registry.yarnpkg.com/@eslint/js/-/js-9.16.0.tgz#3df2b2dd3b9163056616886c86e4082f45dbf3f4"
   integrity sha512-tw2HxzQkrbeuvyj1tG2Yqq+0H9wGoI2IMk4EOsQeX+vmd75FtJAzf+gTA69WF+baUKRYQ3x2kbLE08js5OsTVg==
 
+"@eslint/object-schema@^2.1.5":
+  version "2.1.5"
+  resolved "https://registry.yarnpkg.com/@eslint/object-schema/-/object-schema-2.1.5.tgz#8670a8f6258a2be5b2c620ff314a1d984c23eb2e"
+  integrity sha512-o0bhxnL89h5Bae5T318nFoFzGy+YE5i/gGkoPAgkmTVdRKTiv3p8JHevPiPaMwoloKfEiiaHlawCqaZMqRm+XQ==
+
+"@eslint/plugin-kit@^0.2.5":
+  version "0.2.5"
+  resolved "https://registry.yarnpkg.com/@eslint/plugin-kit/-/plugin-kit-0.2.5.tgz#ee07372035539e7847ef834e3f5e7b79f09e3a81"
+  integrity sha512-lB05FkqEdUg2AA0xEbUz0SnkXT1LcCTa438W4IWTUh4hdOnVbQyOJ81OrDXsJk/LSiJHubgGEFoR5EHq1NsH1A==
+  dependencies:
+    "@eslint/core" "^0.10.0"
+    levn "^0.4.1"
+
 "@fast-check/ava@^1.1.5":
   version "1.1.5"
   resolved "https://registry.yarnpkg.com/@fast-check/ava/-/ava-1.1.5.tgz#b471ce5252a3d62eb9bc316f1b7b0a79a7c8341f"
@@ -1911,24 +1925,33 @@
     protobufjs "^7.2.5"
     yargs "^17.7.2"
 
-"@humanwhocodes/config-array@^0.13.0":
-  version "0.13.0"
-  resolved "https://registry.yarnpkg.com/@humanwhocodes/config-array/-/config-array-0.13.0.tgz#fb907624df3256d04b9aa2df50d7aa97ec648748"
-  integrity sha512-DZLEEqFWQFiyK6h5YIeynKx7JlvCYWL0cImfSRXZ9l4Sg2efkFGTuFf6vzXjK1cq6IYkU+Eg/JizXw+TD2vRNw==
+"@humanfs/core@^0.19.1":
+  version "0.19.1"
+  resolved "https://registry.yarnpkg.com/@humanfs/core/-/core-0.19.1.tgz#17c55ca7d426733fe3c561906b8173c336b40a77"
+  integrity sha512-5DyQ4+1JEUzejeK1JGICcideyfUbGixgS9jNgex5nqkW+cY7WZhxBigmieN5Qnw9ZosSNVC9KQKyb+GUaGyKUA==
+
+"@humanfs/node@^0.16.6":
+  version "0.16.6"
+  resolved "https://registry.yarnpkg.com/@humanfs/node/-/node-0.16.6.tgz#ee2a10eaabd1131987bf0488fd9b820174cd765e"
+  integrity sha512-YuI2ZHQL78Q5HbhDiBA1X4LmYdXCKCMQIfw0pw7piHJwyREFebJUvrQN4cMssyES6x+vfUbx1CIpaQUKYdQZOw==
   dependencies:
-    "@humanwhocodes/object-schema" "^2.0.3"
-    debug "^4.3.1"
-    minimatch "^3.0.5"
+    "@humanfs/core" "^0.19.1"
+    "@humanwhocodes/retry" "^0.3.0"
 
 "@humanwhocodes/module-importer@^1.0.1":
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz#af5b2691a22b44be847b0ca81641c5fb6ad0172c"
   integrity sha512-bxveV4V8v5Yb4ncFTT3rPSgZBOpCkjfK0y4oVVVJwIuDVBRMDXrPyXRL988i5ap9m9bnyEEjWfm5WkBmtffLfA==
 
-"@humanwhocodes/object-schema@^2.0.3":
-  version "2.0.3"
-  resolved "https://registry.yarnpkg.com/@humanwhocodes/object-schema/-/object-schema-2.0.3.tgz#4a2868d75d6d6963e423bcf90b7fd1be343409d3"
-  integrity sha512-93zYdMES/c1D69yZiKDBj0V24vqNzB/koF26KPaagAfd3P/4gUlh3Dys5ogAK+Exi9QyzlD8x/08Zt7wIKcDcA==
+"@humanwhocodes/retry@^0.3.0":
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/@humanwhocodes/retry/-/retry-0.3.1.tgz#c72a5c76a9fbaf3488e231b13dc52c0da7bab42a"
+  integrity sha512-JBxkERygn7Bv/GbN5Rv8Ul6LVknS+5Bp6RgDC/O8gEBU/yeH5Ui5C/OlWrTb6qct7LjjfT6Re2NxB0ln0yYybA==
+
+"@humanwhocodes/retry@^0.4.1":
+  version "0.4.1"
+  resolved "https://registry.yarnpkg.com/@humanwhocodes/retry/-/retry-0.4.1.tgz#9a96ce501bc62df46c4031fbd970e3cc6b10f07b"
+  integrity sha512-c7hNEllBlenFTHBky65mhq8WD2kbN9Q6gk0bTk8lSBvc554jpXSkST1iePudpt7+A/AQvuHs9EMqjHDXMY1lrA==
 
 "@hutson/parse-repository-url@^3.0.0":
   version "3.0.2"
@@ -1973,10 +1996,10 @@
   resolved "https://registry.yarnpkg.com/@istanbuljs/schema/-/schema-0.1.3.tgz#e45e384e4b8ec16bce2fd903af78450f6bf7ec98"
   integrity sha512-ZXRY4jNvVgSVQ8DL3LTcakaAtXwTVUxE81hslsyD2AtoXW/wVob10HkOJ1X/pAlcI7D+2YoZKg5do8G/w6RYgA==
 
-"@jessie.js/eslint-plugin@^0.4.1":
-  version "0.4.1"
-  resolved "https://registry.yarnpkg.com/@jessie.js/eslint-plugin/-/eslint-plugin-0.4.1.tgz#d45561b9b24b97fd1f8b71e4c90b59be2c544e22"
-  integrity sha512-wCoNtFp0ke+h60bq/47Un91deCRiaAjKg3BIMz+xkN2apv6fn6Xk5pb4/NpNi/fK42m0pj8t4F0ApRadte0LZQ==
+"@jessie.js/eslint-plugin@^0.4.2":
+  version "0.4.2"
+  resolved "https://registry.yarnpkg.com/@jessie.js/eslint-plugin/-/eslint-plugin-0.4.2.tgz#5f1deb7c7df06bff9613a636b211008571e661c6"
+  integrity sha512-7xKyY2zThvoJm9JGgYJylMrlIWYb3/qGK5nU17XZ6VLv9dYxwXzmq//OZJVVn+UqBBL2073+cvx0JDewWR79Yg==
   dependencies:
     requireindex "~1.1.0"
 
@@ -2795,7 +2818,7 @@
   resolved "https://registry.yarnpkg.com/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz#5bd262af94e9d25bd1e71b05deed44876a222e8b"
   integrity sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A==
 
-"@nodelib/fs.walk@^1.2.3", "@nodelib/fs.walk@^1.2.8":
+"@nodelib/fs.walk@^1.2.3":
   version "1.2.8"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz#e95737e8bb6746ddedf69c556953494f196fe69a"
   integrity sha512-oGB+UxlgWcgQkgwo8GcEGwemoTFt3FIO9ababBmaGwXIoBKZ+GTy0pP185beGg7Llih/NSHSV2XAs1lnznocSg==
@@ -3630,7 +3653,7 @@
     "@types/estree" "*"
     "@types/json-schema" "*"
 
-"@types/estree@*", "@types/estree@0.0.39", "@types/estree@1.0.6", "@types/estree@^1.0.0", "@types/estree@^1.0.5":
+"@types/estree@*", "@types/estree@0.0.39", "@types/estree@1.0.6", "@types/estree@^1.0.0", "@types/estree@^1.0.5", "@types/estree@^1.0.6":
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-1.0.6.tgz#628effeeae2064a1b4e79f78e81d87b7e5fc7b50"
   integrity sha512-AYnb1nQyY49te+VRAVgmzfcgjYS91mY5P0TKUDCLEM+gNnA+3T6rWITXRLYCpahpqSQbN5cE+gHpnPyXjHWxcw==
@@ -3711,7 +3734,7 @@
   dependencies:
     "@types/istanbul-lib-report" "*"
 
-"@types/json-schema@*", "@types/json-schema@^7.0.11":
+"@types/json-schema@*", "@types/json-schema@^7.0.11", "@types/json-schema@^7.0.15":
   version "7.0.15"
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.15.tgz#596a1747233694d50f6ad8a7869fcb6f56cf5841"
   integrity sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==
@@ -3994,11 +4017,6 @@
     "@typescript-eslint/types" "8.18.2"
     eslint-visitor-keys "^4.2.0"
 
-"@ungap/structured-clone@^1.2.0":
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/@ungap/structured-clone/-/structured-clone-1.2.0.tgz#756641adb587851b5ccb3e095daf27ae581c8406"
-  integrity sha512-zuVdFrMJiuCDQUMCzQaD6KL28MjnqqN8XnAqiEq9PNm/hCPTSGfrXCOfwj1ow4LFb/tNymJPwsNbVePc1xFqrQ==
-
 "@yarnpkg/lockfile@^1.1.0":
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/@yarnpkg/lockfile/-/lockfile-1.1.0.tgz#e77a97fbd345b76d83245edcd17d393b1b41fb31"
@@ -5420,7 +5438,7 @@ cross-spawn@^6.0.5:
     shebang-command "^1.2.0"
     which "^1.2.9"
 
-cross-spawn@^7.0.0, cross-spawn@^7.0.2, cross-spawn@^7.0.3:
+cross-spawn@^7.0.0, cross-spawn@^7.0.3, cross-spawn@^7.0.6:
   version "7.0.6"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.6.tgz#8a58fe78f00dcd70c370451759dfbfaf03e8ee9f"
   integrity sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==
@@ -5763,13 +5781,6 @@ doctrine@^2.1.0:
   dependencies:
     esutils "^2.0.2"
 
-doctrine@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/doctrine/-/doctrine-3.0.0.tgz#addebead72a6574db783639dc87a121773973961"
-  integrity sha512-yS+Q5i3hBf7GBkd4KG8a7eBNNWNGLTaEwwYWUijIYM7zrlYDM0BFXHjjPWlWZ1Rg7UaddZeIDmi9jF3HmqiQ2w==
-  dependencies:
-    esutils "^2.0.2"
-
 dot-prop@^5.1.0:
   version "5.3.0"
   resolved "https://registry.yarnpkg.com/dot-prop/-/dot-prop-5.3.0.tgz#90ccce708cd9cd82cc4dc8c3ddd9abdd55b20e88"
@@ -6316,10 +6327,10 @@ eslint-rule-documentation@>=1.0.0:
   resolved "https://registry.yarnpkg.com/eslint-rule-documentation/-/eslint-rule-documentation-1.0.23.tgz#4e0886145597a78d24524ec7e0cf18c6fedc23a8"
   integrity sha512-pWReu3fkohwyvztx/oQWWgld2iad25TfUdi6wvhhaDPIQjHU/pyvlKgXFw1kX31SQK2Nq9MH+vRDWB0ZLy8fYw==
 
-eslint-scope@^7.2.2:
-  version "7.2.2"
-  resolved "https://registry.yarnpkg.com/eslint-scope/-/eslint-scope-7.2.2.tgz#deb4f92563390f32006894af62a22dba1c46423f"
-  integrity sha512-dOt21O7lTMhDM+X9mB4GX+DZrZtCUJPL/wlcTqxyrx5IvO0IYtILdtrQGQp+8n5S0gwSVmOf9NQrjMOgfQZlIg==
+eslint-scope@^8.2.0:
+  version "8.2.0"
+  resolved "https://registry.yarnpkg.com/eslint-scope/-/eslint-scope-8.2.0.tgz#377aa6f1cb5dc7592cfd0b7f892fd0cf352ce442"
+  integrity sha512-PHlWUfG6lvPc3yvP5A4PNyBL1W8fkDUccmI21JUu/+GKZBoH/W5u6usENXUrWFRsyoW5ACUjFGgAFQp5gUlb/A==
   dependencies:
     esrecurse "^4.3.0"
     estraverse "^5.2.0"
@@ -6351,55 +6362,51 @@ eslint-visitor-keys@^4.2.0:
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-4.2.0.tgz#687bacb2af884fcdda8a6e7d65c606f46a14cd45"
   integrity sha512-UyLnSehNt62FFhSwjZlHmeokpRK59rcz29j+F1/aDgbkbRTk7wIc9XzdoasMUbRNKDM0qQt/+BJ4BrpFeABemw==
 
-eslint@^8.57.1:
-  version "8.57.1"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-8.57.1.tgz#7df109654aba7e3bbe5c8eae533c5e461d3c6ca9"
-  integrity sha512-ypowyDxpVSYpkXr9WPv2PAZCtNip1Mv5KTW0SCurXv/9iOpcrH9PaqUElksqEB6pChqHGDRCFTyrZlGhnLNGiA==
+eslint@^9.0.0:
+  version "9.18.0"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-9.18.0.tgz#c95b24de1183e865de19f607fda6518b54827850"
+  integrity sha512-+waTfRWQlSbpt3KWE+CjrPPYnbq9kfZIYUqapc0uBXyjTp8aYXZDsUH16m39Ryq3NjAVP4tjuF7KaukeqoCoaA==
   dependencies:
     "@eslint-community/eslint-utils" "^4.2.0"
-    "@eslint-community/regexpp" "^4.6.1"
-    "@eslint/eslintrc" "^2.1.4"
-    "@eslint/js" "8.57.1"
-    "@humanwhocodes/config-array" "^0.13.0"
+    "@eslint-community/regexpp" "^4.12.1"
+    "@eslint/config-array" "^0.19.0"
+    "@eslint/core" "^0.10.0"
+    "@eslint/eslintrc" "^3.2.0"
+    "@eslint/js" "9.18.0"
+    "@eslint/plugin-kit" "^0.2.5"
+    "@humanfs/node" "^0.16.6"
     "@humanwhocodes/module-importer" "^1.0.1"
-    "@nodelib/fs.walk" "^1.2.8"
-    "@ungap/structured-clone" "^1.2.0"
+    "@humanwhocodes/retry" "^0.4.1"
+    "@types/estree" "^1.0.6"
+    "@types/json-schema" "^7.0.15"
     ajv "^6.12.4"
     chalk "^4.0.0"
-    cross-spawn "^7.0.2"
+    cross-spawn "^7.0.6"
     debug "^4.3.2"
-    doctrine "^3.0.0"
     escape-string-regexp "^4.0.0"
-    eslint-scope "^7.2.2"
-    eslint-visitor-keys "^3.4.3"
-    espree "^9.6.1"
-    esquery "^1.4.2"
+    eslint-scope "^8.2.0"
+    eslint-visitor-keys "^4.2.0"
+    espree "^10.3.0"
+    esquery "^1.5.0"
     esutils "^2.0.2"
     fast-deep-equal "^3.1.3"
-    file-entry-cache "^6.0.1"
+    file-entry-cache "^8.0.0"
     find-up "^5.0.0"
     glob-parent "^6.0.2"
-    globals "^13.19.0"
-    graphemer "^1.4.0"
     ignore "^5.2.0"
     imurmurhash "^0.1.4"
     is-glob "^4.0.0"
-    is-path-inside "^3.0.3"
-    js-yaml "^4.1.0"
     json-stable-stringify-without-jsonify "^1.0.1"
-    levn "^0.4.1"
     lodash.merge "^4.6.2"
     minimatch "^3.1.2"
     natural-compare "^1.4.0"
     optionator "^0.9.3"
-    strip-ansi "^6.0.1"
-    text-table "^0.2.0"
 
 esm@agoric-labs/esm#Agoric-built:
   version "3.2.25"
   resolved "https://codeload.github.com/agoric-labs/esm/tar.gz/3603726ad4636b2f865f463188fcaade6375638e"
 
-espree@^10.0.1:
+espree@^10.0.1, espree@^10.3.0:
   version "10.3.0"
   resolved "https://registry.yarnpkg.com/espree/-/espree-10.3.0.tgz#29267cf5b0cb98735b65e64ba07e0ed49d1eed8a"
   integrity sha512-0QYC8b24HWY8zjRnDTL6RiHfDbAWn63qb4LMj1Z4b076A4une81+z03Kg7l7mn/48PUTqoLptSXez8oknU8Clg==
@@ -6408,7 +6415,7 @@ espree@^10.0.1:
     acorn-jsx "^5.3.2"
     eslint-visitor-keys "^4.2.0"
 
-espree@^9.0.0, espree@^9.6.0, espree@^9.6.1:
+espree@^9.0.0:
   version "9.6.1"
   resolved "https://registry.yarnpkg.com/espree/-/espree-9.6.1.tgz#a2a17b8e434690a5432f2f8018ce71d331a48c6f"
   integrity sha512-oruZaFkjorTpF32kDSI5/75ViwGeZginGGy2NoOSg3Q9bnwlnmDm4HLnkl0RE3n+njDXR037aY1+x58Z/zFdwQ==
@@ -6427,7 +6434,7 @@ espurify@^2.1.1:
   resolved "https://registry.yarnpkg.com/espurify/-/espurify-2.1.1.tgz#afb043f22fac908d991dd25f7bf40bcf03935b9c"
   integrity sha512-zttWvnkhcDyGOhSH4vO2qCBILpdCMv/MX8lp4cqgRkQoDRGK2oZxi2GfWhlP2dIXmk7BaKeOTuzbHhyC68o8XQ==
 
-esquery@^1.4.2, esquery@^1.5.0:
+esquery@^1.5.0:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/esquery/-/esquery-1.6.0.tgz#91419234f804d852a82dceec3e16cdc22cf9dae7"
   integrity sha512-ca9pw9fomFcKPvFLXhBKUK90ZvGibiGOvRJNbjljY7s7uq/5YO4BOzcYtJqExdx99rF6aAcnRxHmcUHcz6sQsg==
@@ -6745,12 +6752,12 @@ figures@^6.1.0:
   dependencies:
     is-unicode-supported "^2.0.0"
 
-file-entry-cache@^6.0.1:
-  version "6.0.1"
-  resolved "https://registry.yarnpkg.com/file-entry-cache/-/file-entry-cache-6.0.1.tgz#211b2dd9659cb0394b073e7323ac3c933d522027"
-  integrity sha512-7Gps/XWymbLk2QLYK4NzpMOrYjMhdIxXuIvy2QBsLE6ljuodKvdkWs/cpyJJ3CVIVpH0Oi1Hvg1ovbMzLdFBBg==
+file-entry-cache@^8.0.0:
+  version "8.0.0"
+  resolved "https://registry.yarnpkg.com/file-entry-cache/-/file-entry-cache-8.0.0.tgz#7787bddcf1131bffb92636c69457bbc0edd6d81f"
+  integrity sha512-XXTUwCvisa5oacNGRP9SfNtYBNAMi+RPwBFmblZEF7N7swHYQS6/Zfk7SRwx4D5j3CH211YNRco1DEMNVfZCnQ==
   dependencies:
-    flat-cache "^3.0.4"
+    flat-cache "^4.0.0"
 
 file-uri-to-path@1.0.0:
   version "1.0.0"
@@ -6827,14 +6834,13 @@ find-yarn-workspace-root@^2.0.0:
   dependencies:
     micromatch "^4.0.2"
 
-flat-cache@^3.0.4:
-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/flat-cache/-/flat-cache-3.2.0.tgz#2c0c2d5040c99b1632771a9d105725c0115363ee"
-  integrity sha512-CYcENa+FtcUKLmhhqyctpclsq7QF38pKjZHsGNiSQF5r4FtoKDWabFDl3hzaEQMvT1LHEysw5twgLvpYYb4vbw==
+flat-cache@^4.0.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/flat-cache/-/flat-cache-4.0.1.tgz#0ece39fcb14ee012f4b0410bd33dd9c1f011127c"
+  integrity sha512-f7ccFPK3SXFHpx15UIGyRJ/FJQctuKZ0zVuN3frBo4HnK3cay9VEW0R6yPYFHC0AgqhukPzKjq22t5DmAyqGyw==
   dependencies:
     flatted "^3.2.9"
-    keyv "^4.5.3"
-    rimraf "^3.0.2"
+    keyv "^4.5.4"
 
 flat@^5.0.2:
   version "5.0.2"
@@ -7217,13 +7223,6 @@ globals@^11.1.0:
   resolved "https://registry.yarnpkg.com/globals/-/globals-11.12.0.tgz#ab8795338868a0babd8525758018c2a7eb95c42e"
   integrity sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA==
 
-globals@^13.19.0:
-  version "13.24.0"
-  resolved "https://registry.yarnpkg.com/globals/-/globals-13.24.0.tgz#8432a19d78ce0c1e833949c36adb345400bb1171"
-  integrity sha512-AhO5QUcj8llrbG09iWhPU2B204J1xnPeL8kQmVorSsy+Sjj1sk8gIyh6cUocGmH4L0UuhAJy+hJMRA4mgA4mFQ==
-  dependencies:
-    type-fest "^0.20.2"
-
 globals@^14.0.0:
   version "14.0.0"
   resolved "https://registry.yarnpkg.com/globals/-/globals-14.0.0.tgz#898d7413c29babcf6bafe56fcadded858ada724e"
@@ -7967,11 +7966,6 @@ is-obj@^2.0.0:
   resolved "https://registry.yarnpkg.com/is-obj/-/is-obj-2.0.0.tgz#473fb05d973705e3fd9620545018ca8e22ef4982"
   integrity sha512-drqDG3cbczxxEJRoOXcOjtdp1J/lyp1mNn0xaznRs8+muBhgQcrnbspox5X5fOw0HnMnbfDzvnEMEtqDEJEo8w==
 
-is-path-inside@^3.0.3:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/is-path-inside/-/is-path-inside-3.0.3.tgz#d231362e53a07ff2b0e0ea7fed049161ffd16283"
-  integrity sha512-Fd4gABb+ycGAmKou8eMftCupSir5lRxqf4aD/vd0cD2qc4HL07OjCeuHMr8Ro4CoMaeCKDB0/ECBOVWjTwUvPQ==
-
 is-plain-obj@^1.0.0, is-plain-obj@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/is-plain-obj/-/is-plain-obj-1.1.0.tgz#71a50c8429dfca773c92a390a4a03b39fcd51d3e"
@@ -8462,7 +8456,7 @@ jws@^4.0.0:
     jwa "^2.0.0"
     safe-buffer "^5.0.1"
 
-keyv@^4.5.3:
+keyv@^4.5.4:
   version "4.5.4"
   resolved "https://registry.yarnpkg.com/keyv/-/keyv-4.5.4.tgz#a879a99e29452f942439f2a405e3af8b31d4de93"
   integrity sha512-oxVHkHR/EJf2CNXnWxRLW6mg7JyCCUcG0DtEGmL2ctUo1PNTin1PUil+r/+4r5MpVgC/fn1kjsx7mjSujKqIpw==
@@ -9309,7 +9303,7 @@ minimatch@5.1.0:
   dependencies:
     brace-expansion "^2.0.1"
 
-minimatch@^3.0.4, minimatch@^3.0.5, minimatch@^3.1.1, minimatch@^3.1.2:
+minimatch@^3.0.4, minimatch@^3.1.1, minimatch@^3.1.2:
   version "3.1.2"
   resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.1.2.tgz#19cd194bfd3e428f049a70817c038d89ab4be35b"
   integrity sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==
@@ -11987,11 +11981,6 @@ text-hex@1.0.x:
   resolved "https://registry.yarnpkg.com/text-hex/-/text-hex-1.0.0.tgz#69dc9c1b17446ee79a92bf5b884bb4b9127506f5"
   integrity sha512-uuVGNWzgJ4yhRaNSiubPY7OjISw4sw4E5Uv0wbjp+OzcbmVU/rsT8ujgcXJhn9ypzsgr5vlzpPqP+MBBKcGvbg==
 
-text-table@^0.2.0:
-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/text-table/-/text-table-0.2.0.tgz#7f5ee823ae805207c00af2df4a84ec3fcfa570b4"
-  integrity sha512-N+8UisAXDGk8PFXP4HAzVR9nbfmVJ3zYLAWiTIoqC5v5isinhr+r5uaO8+7r3BMfuNIufIsA7RdpVgacC2cSpw==
-
 thenify-all@^1.0.0:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/thenify-all/-/thenify-all-1.6.0.tgz#1a1918d402d8fc3f98fbf234db0bcc8cc10e9726"
@@ -12202,11 +12191,6 @@ type-fest@^0.18.0:
   resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.18.1.tgz#db4bc151a4a2cf4eebf9add5db75508db6cc841f"
   integrity sha512-OIAYXk8+ISY+qTOwkHtKqzAuxchoMiD9Udx+FSGQDuiRR+PJKJHc2NJAXlbhkGwTt/4/nKZxELY1w3ReWOL8mw==
 
-type-fest@^0.20.2:
-  version "0.20.2"
-  resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.20.2.tgz#1bf207f4b28f91583666cb5fbd327887301cd5f4"
-  integrity sha512-Ne+eE4r0/iWnpAxD852z3A+N0Bt5RN//NjJwRd2VFHEmrywxf5vsZlh4R6lixl6B+wz/8d+maTSAkN1FIkI3LQ==
-
 type-fest@^0.21.3:
   version "0.21.3"
   resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.21.3.tgz#d260a24b0198436e133fa26a524a6d65fa3b2e37"

From 78b053b23d351d3896c888fbdcd70185c1952212 Mon Sep 17 00:00:00 2001
From: Ikenna Omekam <ikenna@agoric.com>
Date: Fri, 17 Jan 2025 17:02:04 -0600
Subject: [PATCH 2/3] chore(cosmic-swingset): fix linting by using status
 instead of code

---
 packages/cosmic-swingset/check-validator.cjs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/cosmic-swingset/check-validator.cjs b/packages/cosmic-swingset/check-validator.cjs
index 75fa338c706..72f54e75f43 100755
--- a/packages/cosmic-swingset/check-validator.cjs
+++ b/packages/cosmic-swingset/check-validator.cjs
@@ -22,8 +22,8 @@ if (ret.error) {
 if (ret.stderr) {
   process.stderr.write(ret.stderr);
 }
-if (ret.code) {
-  process.exit(ret.code);
+if (ret.status) {
+  process.exit(ret.status);
 }
 
 const output = ret.stdout.toString('utf-8');

From 6bd3574e6b2e403d6b9de0a4e3b54af1d3461f3b Mon Sep 17 00:00:00 2001
From: Ikenna Omekam <ikenna@agoric.com>
Date: Tue, 21 Jan 2025 11:00:28 -0600
Subject: [PATCH 3/3] chore(multichain-testing): adapt to eslint v9 flat config

---
 multichain-testing/eslint.config.mjs         |  46 ++++
 multichain-testing/package.json              |  28 +-
 multichain-testing/scripts/fast-usdc-tool.ts |   1 -
 multichain-testing/tools/e2e-tools.js        |   3 +-
 multichain-testing/tsconfig.json             |   8 +-
 multichain-testing/yarn.lock                 | 257 ++++++++++---------
 6 files changed, 190 insertions(+), 153 deletions(-)
 create mode 100644 multichain-testing/eslint.config.mjs

diff --git a/multichain-testing/eslint.config.mjs b/multichain-testing/eslint.config.mjs
new file mode 100644
index 00000000000..e00ced55f49
--- /dev/null
+++ b/multichain-testing/eslint.config.mjs
@@ -0,0 +1,46 @@
+import typescriptEslint from '@typescript-eslint/eslint-plugin';
+import globals from 'globals';
+import tsParser from '@typescript-eslint/parser';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import js from '@eslint/js';
+import { FlatCompat } from '@eslint/eslintrc';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+});
+
+export default [
+  ...compat.extends(
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'prettier',
+  ),
+  {
+    plugins: {
+      '@typescript-eslint': typescriptEslint,
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.node,
+      },
+
+      parser: tsParser,
+    },
+
+    rules: {
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        {
+          argsIgnorePattern: '^_',
+          varsIgnorePattern: '^_',
+        },
+      ],
+    },
+  },
+];
diff --git a/multichain-testing/package.json b/multichain-testing/package.json
index 264df591262..a66ebd41c34 100644
--- a/multichain-testing/package.json
+++ b/multichain-testing/package.json
@@ -5,7 +5,7 @@
   "scripts": {
     "build": "exit 0",
     "lint": "yarn tsc && yarn eslint .",
-    "lint-fix": "yarn lint:eslint --fix",
+    "lint-fix": "yarn eslint . --fix",
     "test": "echo 'Run specific test suites:\nyarn test:main (needs `make start`)\nyarn test:fast-usdc (needs `make start FILE=config.fusdc.yaml`)'",
     "test:main": "ava --config ava.main.config.js",
     "test:fast-usdc": "ava --config ava.fusdc.config.js",
@@ -32,7 +32,7 @@
     "@typescript-eslint/eslint-plugin": "^8.17.0",
     "@typescript-eslint/parser": "^8.17.0",
     "ava": "^6.2.0",
-    "eslint": "^8.56.0",
+    "eslint": "^9.0.0",
     "eslint-config-prettier": "^9.1.0",
     "execa": "9.1.0",
     "fs-extra": "^11.2.0",
@@ -91,29 +91,5 @@
     "@agoric/zoe": "portal:../packages/zoe",
     "@agoric/zone": "portal:../packages/zone"
   },
-  "eslintConfig": {
-    "root": true,
-    "env": {
-      "node": true
-    },
-    "parser": "@typescript-eslint/parser",
-    "plugins": [
-      "@typescript-eslint"
-    ],
-    "extends": [
-      "eslint:recommended",
-      "plugin:@typescript-eslint/recommended",
-      "prettier"
-    ],
-    "rules": {
-      "@typescript-eslint/no-unused-vars": [
-        "error",
-        {
-          "argsIgnorePattern": "^_",
-          "varsIgnorePattern": "^_"
-        }
-      ]
-    }
-  },
   "license": "Apache-2.0"
 }
diff --git a/multichain-testing/scripts/fast-usdc-tool.ts b/multichain-testing/scripts/fast-usdc-tool.ts
index db51c913a05..f5b962ec445 100755
--- a/multichain-testing/scripts/fast-usdc-tool.ts
+++ b/multichain-testing/scripts/fast-usdc-tool.ts
@@ -184,7 +184,6 @@ const main = async () => {
         instancePath: [contractName],
         callPipe: [['makeDepositInvitation']],
       },
-      // @ts-expect-error 'NatAmount' vs 'AnyAmount'
       proposal,
     });
   };
diff --git a/multichain-testing/tools/e2e-tools.js b/multichain-testing/tools/e2e-tools.js
index bc46cc6fba6..a9ab231d5ad 100644
--- a/multichain-testing/tools/e2e-tools.js
+++ b/multichain-testing/tools/e2e-tools.js
@@ -25,9 +25,8 @@ const trace = makeTracer('E2ET');
 const BLD = '000000ubld';
 
 export const txAbbr = tx => {
-  // eslint-disable-next-line camelcase
   const { txhash, code, height, gas_used } = tx;
-  // eslint-disable-next-line camelcase
+
   return { txhash, code, height, gas_used };
 };
 
diff --git a/multichain-testing/tsconfig.json b/multichain-testing/tsconfig.json
index c0b1b588fec..df9da8606db 100644
--- a/multichain-testing/tsconfig.json
+++ b/multichain-testing/tsconfig.json
@@ -1,8 +1,14 @@
 {
   "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "allowImportingTsExtensions": true,
+    "noUnusedLocals": false,
+    "noUnusedParameters": false
+  },
   "include": [
     "src",
     "tools",
-    "test"
+    "test",
+    "scripts"
   ]
 }
diff --git a/multichain-testing/yarn.lock b/multichain-testing/yarn.lock
index 8f909306465..4ba72d982e1 100644
--- a/multichain-testing/yarn.lock
+++ b/multichain-testing/yarn.lock
@@ -1157,34 +1157,71 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@eslint-community/regexpp@npm:^4.10.0, @eslint-community/regexpp@npm:^4.6.1":
+"@eslint-community/regexpp@npm:^4.10.0, @eslint-community/regexpp@npm:^4.12.1":
   version: 4.12.1
   resolution: "@eslint-community/regexpp@npm:4.12.1"
   checksum: 10c0/a03d98c246bcb9109aec2c08e4d10c8d010256538dcb3f56610191607214523d4fb1b00aa81df830b6dffb74c5fa0be03642513a289c567949d3e550ca11cdf6
   languageName: node
   linkType: hard
 
-"@eslint/eslintrc@npm:^2.1.4":
-  version: 2.1.4
-  resolution: "@eslint/eslintrc@npm:2.1.4"
+"@eslint/config-array@npm:^0.19.0":
+  version: 0.19.1
+  resolution: "@eslint/config-array@npm:0.19.1"
+  dependencies:
+    "@eslint/object-schema": "npm:^2.1.5"
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     "@typescript-eslint/parser": "npm:^8.17.0"
     ava: "npm:^6.2.0"
-    eslint: "npm:^8.56.0"
+    eslint: "npm:^9.0.0"
     eslint-config-prettier: "npm:^9.1.0"
     execa: "npm:9.1.0"
     fs-extra: "npm:^11.2.0"
@@ -5373,13 +5398,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"text-table@npm:^0.2.0":
-  version: 0.2.0
-  resolution: "text-table@npm:0.2.0"
-  checksum: 10c0/02805740c12851ea5982686810702e2f14369a5f4c5c40a836821e3eefc65ffeec3131ba324692a37608294b0fd8c1e55a2dd571ffed4909822787668ddbee5c
-  languageName: node
-  linkType: hard
-
 "time-zone@npm:^1.0.0":
   version: 1.0.0
   resolution: "time-zone@npm:1.0.0"
@@ -5469,13 +5487,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"type-fest@npm:^0.20.2":
-  version: 0.20.2
-  resolution: "type-fest@npm:0.20.2"
-  checksum: 10c0/dea9df45ea1f0aaa4e2d3bed3f9a0bfe9e5b2592bddb92eb1bf06e50bcf98dbb78189668cd8bc31a0511d3fc25539b4cd5c704497e53e93e2d40ca764b10bfc3
-  languageName: node
-  linkType: hard
-
 "typescript@npm:5.1.6 - 5.7.x, typescript@npm:^5.4.5, typescript@npm:~5.7.2":
   version: 5.7.2
   resolution: "typescript@npm:5.7.2"