feat(timestamp): add new plugin to fetch timestamp

pkg/timestamp/.npmignore

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+../../.npmignore

pkg/timestamp/package.json

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+{
+	"name": "@slangroom/timestamp",
+	"version": "1.19.0",
+	"dependencies": {
+		"@slangroom/core": "workspace:*",
+		"@slangroom/shared": "workspace:*"
+	},
+	"repository": "https://github.com/dyne/slangroom",
+	"license": "AGPL-3.0-only",
+	"type": "module",
+	"main": "./build/esm/src/index.js",
+	"types": "./build/esm/src/index.d.ts",
+	"exports": {
+		".": {
+			"import": {
+				"types": "./build/esm/src/index.d.ts",
+				"default": "./build/esm/src/index.js"
+			}
+		},
+		"./*": {
+			"import": {
+				"types": "./build/esm/src/*.d.ts",
+				"default": "./build/esm/src/*.js"
+			}
+		}
+	},
+	"publishConfig": {
+		"access": "public"
+	}
+}

pkg/timestamp/src/index.ts

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+export * from '@slangroom/timestamp/plugin';

pkg/timestamp/src/plugin.ts

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+import { Plugin } from '@slangroom/core';
+
+const p = new Plugin();
+
+export const milliseconds = p.new('fetch the local timestamp in milliseconds', async (ctx) => {
+	const t = new Date().getTime();
+	return ctx.pass(t.toString());
+});
+
+export const seconds = p.new('fetch the local timestamp in seconds', async (ctx) => {
+	const t = new Date().getTime() / 1000;
+	return ctx.pass(t.toString());
+});
+
+export const timestamp = p;

pkg/timestamp/test/e2e.ts

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+import test from 'ava';
+import { Slangroom } from '@slangroom/core';
+import { timestamp } from '@slangroom/timestamp';
+
+test('fetch timestamp in seconds', async (t) => {
+	const contract = `Rule unknown ignore
+Given I fetch the local timestamp in seconds and output into 'output'
+Given I have a 'string' named 'output'
+Then print data
+`
+    const sl = new Slangroom(timestamp);
+	const res = await sl.execute(contract);
+	const ts = new Date().getTime() / 1000;
+	t.true(Math.abs(Number(res) - ts) < 100);
+});
+
+test('fetch timestamp in milliseconds', async (t) => {
+	const contract = `Rule unknown ignore
+Given I fetch the local timestamp in seconds and output into 'output'
+Given I have a 'string' named 'output'
+Then print data
+`
+    const sl = new Slangroom(timestamp);
+	const res = await sl.execute(contract);
+	const ts = new Date().getTime();
+	t.true(Math.abs(Number(res) - ts) < 100);
+});

pkg/timestamp/tsconfig.json

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+../../tsconfig.json