add metadata and build process

.gitignore

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+/dist/
+/node_modules/
+/package-lock.json
+/pnpm-lock.yaml
+/shrinkwrap.yaml
+/yarn.lock

.prettierrc.yaml

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+printWidth: 120
+useTabs: true
+singleQuote: true
+trailingComma: all

package.json

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+{
+	"name": "@conduitry/autocache",
+	"version": "0.0.0",
+	"description": "A cache that cleans itself",
+	"keywords": [
+		"cache"
+	],
+	"main": "dist/index.cjs.js",
+	"module": "dist/index.esm.js",
+	"types": "types/index.d.ts",
+	"files": [
+		"dist",
+		"types"
+	],
+	"engines": {
+		"node": "^12"
+	},
+	"repository": {
+		"type": "git",
+		"url": "https://github.com/Conduitry/autocache.git"
+	},
+	"author": "Conduitry",
+	"license": "MIT",
+	"bugs": {
+		"url": "https://github.com/Conduitry/autocache/issues"
+	},
+	"devDependencies": {
+		"@types/node": "=12",
+		"rollup": "^2",
+		"rollup-plugin-cheap-ts": "Conduitry/rollup-plugin-cheap-ts#semver:^1",
+		"typescript": "^4"
+	},
+	"scripts": {
+		"build": "rollup -c",
+		"dev": "rollup -cw",
+		"prepare": "npm run build"
+	}
+}

rollup.config.js

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+import cheap_ts from 'rollup-plugin-cheap-ts';
+
+export default {
+	input: './src/index',
+	external: name => /^[a-z]/.test(name),
+	plugins: [cheap_ts()],
+	output: [
+		{ file: 'dist/index.cjs.js', format: 'cjs', sourcemap: true, interop: false, preferConst: true },
+		{ file: 'dist/index.esm.js', format: 'esm', sourcemap: true, preferConst: true },
+	],
+};

tsconfig.json

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+{
+	"compilerOptions": {
+		"noImplicitAny": true,
+		"noImplicitThis": true,
+		"noUnusedLocals": true,
+		"removeComments": true,
+		"sourceMap": true,
+		"target": "esnext"
+	},
+	"include": ["src"]
+}