feat: Add estree-toolkit as a JS transformer, upgrade meriyah

website/package.json

@@ -92,6 +92,7 @@
     "eslint4": "npm:eslint@^4",
     "espree": "^6.2.1",
     "esprima": "^4.0.1",
+    "estree-toolkit": "^1.3.1",
     "filbert": "^0.1.20",
     "flow-parser": "^0.144.0",
     "font-awesome": "^4.5.0",
@@ -112,7 +113,7 @@
     "lodash.isequal": "^4.5.0",
     "luaparse": "^0.3.0",
     "lucene": "^2.1.1",
-    "meriyah": "^1.9.12",
+    "meriyah": "^4.2.0",
     "parse5": "^6.0.0",
     "parse5-htmlparser2-tree-adapter": "^6.0.0",
     "pbkit": "^0.0.12",

website/src/parsers/js/transformers/estree-toolkit/codeExample.txt

@@ -0,0 +1,19 @@
+export default function transform(code, { estreeToolkit, parsers }) {
+  const {
+    builders: b,
+    is,
+    traverse,
+    utils
+  } = estreeToolkit;
+
+  // There are many parsers, use any of them to generate an AST
+  const ast = parsers.meriyah.parseModule(code);
+
+  traverse(ast, {
+    Identifier(path) {
+      path.node.name = path.node.name.split('').reverse().join('');
+    }
+  });
+
+  return ast;
+}

website/src/parsers/js/transformers/estree-toolkit/index.js

@@ -0,0 +1,59 @@
+import compileModule from '../../../utils/compileModule';
+import pkg from 'estree-toolkit/package.json';
+
+const ID = 'estree-toolkit';
+
+export default {
+  id: ID,
+  displayName: ID,
+  version: pkg.version,
+  homepage: pkg.homepage || 'https://github.com/sarsamurmu/estree-toolkit',
+
+  defaultParserID: 'meriyah',
+
+  loadTransformer(callback) {
+    require(
+      [
+        '../../../transpilers/babel',
+        'estree-toolkit',
+        'recast',
+        'acorn',
+        'espree',
+        'esprima',
+        'meriyah',
+        'seafox',
+        'tenko',
+      ],
+      (transpile, estreeToolkit, recast, acorn, espree, esprima, meriyah, seafox, tenko) => {
+        callback({
+          transpile: transpile.default,
+          estreeToolkit,
+          recast,
+          parsers: { acorn, espree, esprima, meriyah, seafox, tenko },
+        });
+      },
+    );
+  },
+
+  transform(
+    { transpile, estreeToolkit, recast, parsers },
+    transformCode,
+    code,
+  ) {
+    transformCode = transpile(transformCode);
+    const transformModule = compileModule( // eslint-disable-line no-shadow
+      transformCode,
+    );
+    const transform = transformModule.__esModule ?
+      transformModule.default :
+      transformModule;
+
+    const ast = transform(code, { estreeToolkit, parsers });
+
+    if (ast == null) {
+      throw new Error('`transform` function must return an AST object');
+    }
+
+    return recast.print(ast);
+  },
+};