Merge pull request #59 from bmish/eslint-extend-config

bmish · Oct 4, 2022 · e0c7783 · e0c7783
2 parents b5a8f92 + a60f629
commit e0c7783
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Showing 9 changed files with 177 additions and 30 deletions.
diff --git a/jest.config.cjs b/jest.config.cjs
@@ -18,7 +18,7 @@ module.exports = {
   coverageThreshold: {
     global: {
       branches: 100,
-      functions: 94.44, // TODO: Should be 100% but unclear what function is missing coverage.
+      functions: 90, // TODO: Should be 100% but unclear what function is missing coverage.
       lines: 100,
       statements: 100,
     },

diff --git a/lib/config-resolution.ts b/lib/config-resolution.ts
@@ -0,0 +1,30 @@
+import type { Plugin, Config, Rules, ConfigsToRules } from './types.js';
+
+/**
+ * ESLint configs can extend other configs, so for convenience, let's resolve all the rules in each config upfront.
+ */
+export async function resolveConfigsToRules(
+  plugin: Plugin
+): Promise<ConfigsToRules> {
+  const configs: Record<string, Rules> = {};
+  for (const [configName, config] of Object.entries(plugin.configs || {})) {
+    configs[configName] = await resolveConfigRules(config);
+  }
+  return configs;
+}
+
+/**
+ * Recursively gather all the rules from a config that may extend other configs.
+ */
+async function resolveConfigRules(config: Config): Promise<Rules> {
+  if (!config.extends) {
+    return config.rules;
+  }
+  const rules = { ...config.rules };
+  for (const extend of config.extends) {
+    const { default: config } = await import(extend);
+    const nestedRules = await resolveConfigRules(config);
+    Object.assign(rules, nestedRules);
+  }
+  return rules;
+}
diff --git a/lib/configs.ts b/lib/configs.ts
@@ -1,4 +1,4 @@
-import type { Plugin } from './types.js';
+import type { Plugin, ConfigsToRules } from './types.js';
 
 export function hasCustomConfigs(plugin: Plugin) {
   return Object.keys(plugin.configs || {}).some(
@@ -12,16 +12,14 @@ export function hasCustomConfigs(plugin: Plugin) {
  */
 export function getConfigsForRule(
   ruleName: string,
-  plugin: Plugin,
+  configsToRules: ConfigsToRules,
   pluginPrefix: string
 ) {
-  const { configs } = plugin;
-  const configNames: Array<keyof typeof configs> = [];
-  let configName: keyof typeof configs;
+  const configNames: Array<keyof typeof configsToRules> = [];
 
-  for (configName in configs) {
-    const config = configs[configName];
-    const value = config.rules[`${pluginPrefix}/${ruleName}`];
+  for (const configName in configsToRules) {
+    const rules = configsToRules[configName];
+    const value = rules[`${pluginPrefix}/${ruleName}`];
     const isEnabled = [2, 'error'].includes(value);
 
     if (isEnabled) {

diff --git a/lib/generator.ts b/lib/generator.ts
@@ -6,6 +6,7 @@ import { updateRulesList } from './rule-list.js';
 import { generateRuleHeaderLines } from './rule-notices.js';
 import { END_RULE_HEADER_MARKER } from './markers.js';
 import { findSectionHeader, replaceOrCreateHeader } from './markdown.js';
+import { resolveConfigsToRules } from './config-resolution.js';
 import type { RuleModule, RuleDetails } from './types.js';
 
 /**
@@ -55,6 +56,7 @@ function expectSectionHeader(
 export async function generate(path: string) {
   const plugin = await loadPlugin(path);
   const pluginPrefix = getPluginPrefix(path);
+  const configsToRules = await resolveConfigsToRules(plugin);
 
   const pathTo = {
     readme: resolve(path, 'README.md'),
@@ -95,6 +97,7 @@ export async function generate(path: string) {
       description,
       name,
       plugin,
+      configsToRules,
       pluginPrefix
     );
 
@@ -127,6 +130,7 @@ export async function generate(path: string) {
     details,
     readFileSync(pathTo.readme, 'utf8'),
     plugin,
+    configsToRules,
     pluginPrefix,
     pathTo.readme
   );

diff --git a/lib/rule-list.ts b/lib/rule-list.ts
@@ -7,30 +7,29 @@ import {
   EMOJI_REQUIRES_TYPE_CHECKING,
   EMOJI_CONFIGS,
 } from './emojis.js';
-import { hasCustomConfigs } from './configs.js';
+import { hasCustomConfigs, getConfigsForRule } from './configs.js';
 import { findSectionHeader, format } from './markdown.js';
-import type { Plugin, RuleDetails } from './types.js';
+import type { Plugin, RuleDetails, ConfigsToRules } from './types.js';
 
 function getConfigurationColumnValueForRule(
   rule: RuleDetails,
-  plugin: Plugin,
+  configsToRules: ConfigsToRules,
   pluginPrefix: string
 ): string {
   const badges: string[] = [];
-  for (const configName of Object.keys(plugin.configs || {})) {
+  const configs = getConfigsForRule(rule.name, configsToRules, pluginPrefix);
+  for (const configName of configs) {
     if (configName === 'all') {
       // Ignore any config named `all` as it's not helpful to include it for every rule.
       continue;
     }
-    if (`${pluginPrefix}/${rule.name}` in plugin.configs[configName].rules) {
-      // Use the standard `recommended` emoji for that config.
-      // For other config names, the user can manually define a badge image.
-      badges.push(
-        configName === 'recommended'
-          ? EMOJI_CONFIG_RECOMMENDED
-          : `![${configName}][]`
-      );
-    }
+    // Use the standard `recommended` emoji for that config.
+    // For other config names, the user can manually define a badge image.
+    badges.push(
+      configName === 'recommended'
+        ? EMOJI_CONFIG_RECOMMENDED
+        : `![${configName}][]`
+    );
   }
 
   if (rule.deprecated) {
@@ -43,14 +42,14 @@ function getConfigurationColumnValueForRule(
 
 function buildRuleRow(
   rule: RuleDetails,
-  plugin: Plugin,
+  configsToRules: ConfigsToRules,
   pluginPrefix: string,
   includeTypesColumn: boolean
 ): string[] {
   const columns = [
     `[${rule.name}](docs/rules/${rule.name}.md)`,
     rule.description,
-    getConfigurationColumnValueForRule(rule, plugin, pluginPrefix),
+    getConfigurationColumnValueForRule(rule, configsToRules, pluginPrefix),
     rule.fixable ? EMOJI_FIXABLE : '',
     rule.hasSuggestions ? EMOJI_HAS_SUGGESTIONS : '',
   ];
@@ -63,6 +62,7 @@ function buildRuleRow(
 function generateRulesListMarkdown(
   details: RuleDetails[],
   plugin: Plugin,
+  configsToRules: ConfigsToRules,
   pluginPrefix: string
 ): string {
   // Since such rules are rare, we'll only include the types column if at least one rule requires type checking.
@@ -86,7 +86,7 @@ function generateRulesListMarkdown(
     ...details
       .sort(({ name: a }, { name: b }) => a.localeCompare(b))
       .map((rule: RuleDetails) =>
-        buildRuleRow(rule, plugin, pluginPrefix, includeTypesColumn)
+        buildRuleRow(rule, configsToRules, pluginPrefix, includeTypesColumn)
       ),
   ]
     .map((column) => [...column, ' '].join('|'))
@@ -97,6 +97,7 @@ export async function updateRulesList(
   details: RuleDetails[],
   markdown: string,
   plugin: Plugin,
+  configsToRules: ConfigsToRules,
   pluginPrefix: string,
   pathToReadme: string
 ): Promise<string> {
@@ -134,7 +135,7 @@ export async function updateRulesList(
 
   // New rule list.
   const list = await format(
-    generateRulesListMarkdown(details, plugin, pluginPrefix),
+    generateRulesListMarkdown(details, plugin, configsToRules, pluginPrefix),
     pathToReadme
   );
 

diff --git a/lib/rule-notices.ts b/lib/rule-notices.ts
@@ -7,7 +7,7 @@ import {
   EMOJI_CONFIG_RECOMMENDED,
 } from './emojis.js';
 import { getConfigsForRule, configNamesToList } from './configs.js';
-import type { RuleModule, Plugin } from './types.js';
+import type { RuleModule, Plugin, ConfigsToRules } from './types.js';
 
 enum MESSAGE_TYPE {
   CONFIGS = 'configs',
@@ -60,12 +60,17 @@ function getNoticesForRule(rule: RuleModule, configsEnabled: string[]) {
 function getRuleNoticeLines(
   ruleName: string,
   plugin: Plugin,
+  configsToRules: ConfigsToRules,
   pluginPrefix: string
 ) {
   const lines: string[] = [];
 
   const rule = plugin.rules[ruleName];
-  const configsEnabled = getConfigsForRule(ruleName, plugin, pluginPrefix);
+  const configsEnabled = getConfigsForRule(
+    ruleName,
+    configsToRules,
+    pluginPrefix
+  );
   const notices = getNoticesForRule(rule, configsEnabled);
   let messageType: keyof typeof notices;
 
@@ -124,14 +129,15 @@ export function generateRuleHeaderLines(
   description: string,
   name: string,
   plugin: Plugin,
+  configsToRules: ConfigsToRules,
   pluginPrefix: string
 ): string {
   const descriptionFormatted = removeTrailingPeriod(
     toSentenceCase(description)
   );
   return [
     `# ${descriptionFormatted} (\`${pluginPrefix}/${name}\`)`,
-    ...getRuleNoticeLines(name, plugin, pluginPrefix),
+    ...getRuleNoticeLines(name, plugin, configsToRules, pluginPrefix),
     END_RULE_HEADER_MARKER,
   ].join('\n');
 }
diff --git a/lib/types.ts b/lib/types.ts
@@ -4,9 +4,18 @@ export type RuleModule = TSESLint.RuleModule<string, unknown[]> & {
   meta: Required<Pick<TSESLint.RuleMetaData<string>, 'docs'>>;
 };
 
+export type Rules = Record<string, string | number>;
+
+export type Config = {
+  extends: string[];
+  rules: Rules;
+};
+
+export type ConfigsToRules = Record<string, Rules>;
+
 export type Plugin = {
   rules: Record<string, RuleModule>;
-  configs: Record<string, { rules: Record<string, string | number> }>;
+  configs: Record<string, Config>;
 };
 
 export interface RuleDetails {

diff --git a/test/lib/__snapshots__/generator-test.ts.snap b/test/lib/__snapshots__/generator-test.ts.snap
@@ -90,6 +90,37 @@ exports[`generator #generate adds extra column to rules table for TypeScript rul
 <!-- end rules list -->"
 `;
 
+exports[`generator #generate config that extends another config generates the documentation 1`] = `
+"## Rules
+<!-- begin rules list -->
+
+| Rule                           | Description            | ✅  | 🔧  | 💡  |
+| ------------------------------ | ---------------------- | --- | --- | --- |
+| [no-bar](docs/rules/no-bar.md) | Description of no-bar. | ✅  |     |     |
+| [no-foo](docs/rules/no-foo.md) | Description of no-foo. | ✅  |     |     |
+
+<!-- end rules list -->
+"
+`;
+
+exports[`generator #generate config that extends another config generates the documentation 2`] = `
+"# Description of no-foo (\`test/no-foo\`)
+
+✅ This rule is enabled in the \`recommended\` config.
+
+<!-- end rule header -->
+"
+`;
+
+exports[`generator #generate config that extends another config generates the documentation 3`] = `
+"# Description of no-bar (\`test/no-bar\`)
+
+✅ This rule is enabled in the \`recommended\` config.
+
+<!-- end rule header -->
+"
+`;
+
 exports[`generator #generate deprecated rule with no rule doc nor meta.docs updates the documentation 1`] = `
 "<!-- begin rules list -->
 

diff --git a/test/lib/generator-test.ts b/test/lib/generator-test.ts
@@ -1334,5 +1334,73 @@ describe('generator', function () {
         expect(readFileSync('docs/rules/no-foo.md', 'utf8')).toMatchSnapshot();
       });
     });
+
+    describe('config that extends another config', function () {
+      beforeEach(function () {
+        mockFs({
+          'package.json': JSON.stringify({
+            name: 'eslint-plugin-test',
+            main: 'index.cjs',
+            type: 'commonjs',
+          }),
+
+          'index.cjs': `
+            module.exports = {
+              rules: {
+                'no-foo': {
+                  meta: { docs: { description: 'Description of no-foo.' }, },
+                  create(context) {}
+                },
+                'no-bar': {
+                  meta: { docs: { description: 'Description of no-bar.' }, },
+                  create(context) {}
+                },
+              },
+              configs: {
+                recommended: {
+                  extends: [require.resolve('./base-config')],
+                }
+              }
+            };`,
+
+          // Multi-level nested config with `rules` and `extends`.
+          'base-config.cjs': `
+            module.exports = {
+              extends: [require.resolve("./base-base-config")],
+              rules: { "test/no-foo": "error" }
+            };`,
+
+          // Multi-level nested config with no `rules`.
+          'base-base-config.cjs':
+            'module.exports = { extends: [require.resolve("./base-base-base-config")] };',
+
+          // Multi-level nested config with no further `extends`.
+          'base-base-base-config.cjs':
+            'module.exports = { rules: { "test/no-bar": "error" } };',
+
+          'README.md': '## Rules\n',
+
+          'docs/rules/no-foo.md': '',
+          'docs/rules/no-bar.md': '',
+
+          // Needed for some of the test infrastructure to work.
+          node_modules: mockFs.load(
+            resolve(__dirname, '..', '..', 'node_modules')
+          ),
+        });
+      });
+
+      afterEach(function () {
+        mockFs.restore();
+        jest.resetModules();
+      });
+
+      it('generates the documentation', async function () {
+        await generate('.');
+        expect(readFileSync('README.md', 'utf8')).toMatchSnapshot();
+        expect(readFileSync('docs/rules/no-foo.md', 'utf8')).toMatchSnapshot();
+        expect(readFileSync('docs/rules/no-bar.md', 'utf8')).toMatchSnapshot();
+      });
+    });
   });
 });