main repo

node_modules/eslint-plugin-import/memo-parser/index.js

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+'use strict';
+
+const crypto = require('crypto');
+const moduleRequire = require('eslint-module-utils/module-require').default;
+const hashObject = require('eslint-module-utils/hash').hashObject;
+
+const cache = new Map();
+
+// must match ESLint default options or we'll miss the cache every time
+const parserOptions = {
+  loc: true,
+  range: true,
+  raw: true,
+  tokens: true,
+  comment: true,
+  attachComment: true,
+};
+
+exports.parse = function parse(content, options) {
+  options = { ...options, ...parserOptions };
+
+  if (!options.filePath) {
+    throw new Error('no file path provided!');
+  }
+
+  const keyHash = crypto.createHash('sha256');
+  keyHash.update(content);
+  hashObject(options, keyHash);
+
+  const key = keyHash.digest('hex');
+
+  let ast = cache.get(key);
+  if (ast != null) { return ast; }
+
+  const realParser = moduleRequire(options.parser);
+
+  ast = realParser.parse(content, options);
+  cache.set(key, ast);
+
+  return ast;
+};