Refactor @babel/types to be 100% ES-module (#6741)

This generates the dynamic functions at buildtime and also
splits the package into smaller files to avoid dependency circles.

packages/babel-types/scripts/generateTypeHelpers.js

@@ -0,0 +1,31 @@
+"use strict";
+const fs = require("fs");
+const path = require("path");
+const generateBuilders = require("./generators/generateBuilders");
+const generateValidators = require("./generators/generateValidators");
+const generateAsserts = require("./generators/generateAsserts");
+const generateConstants = require("./generators/generateConstants");
+const format = require("./utils/formatCode");
+
+const baseDir = path.join(__dirname, "../src");
+
+function writeFile(content, location) {
+  const file = path.join(baseDir, location);
+
+  try {
+    fs.mkdirSync(path.dirname(file));
+  } catch (error) {
+    if (error.code !== "EEXIST") {
+      throw error;
+    }
+  }
+
+  fs.writeFileSync(file, format(content, file));
+}
+
+console.log("Generating @babel/types dynamic functions");
+
+writeFile(generateBuilders(), "builders/generated/index.js");
+writeFile(generateValidators(), "validators/generated/index.js");
+writeFile(generateAsserts(), "asserts/generated/index.js");
+writeFile(generateConstants(), "constants/generated/index.js");

packages/babel-types/scripts/generators/generateAsserts.js

@@ -0,0 +1,43 @@
+"use strict";
+const definitions = require("../../lib/definitions");
+
+function addAssertHelper(type) {
+  return `export function assert${type}(node: Object, opts?: Object = {}): void {
+    assert("${type}", node, opts) }
+  `;
+}
+
+module.exports = function generateAsserts() {
+  let output = `// @flow
+/*
+ * This file is auto-generated! Do not modify it directly.
+ * To re-generate run 'make build'
+ */
+import is from "../../validators/is";
+
+function assert(type: string, node: Object, opts?: Object): void {
+  if (!is(type, node, opts)) {
+    throw new Error(
+      \`Expected type "\${type}" with option \${JSON.stringify(opts)}\`,
+    );
+  }
+}\n\n`;
+
+  Object.keys(definitions.VISITOR_KEYS).forEach(type => {
+    output += addAssertHelper(type);
+  });
+
+  Object.keys(definitions.FLIPPED_ALIAS_KEYS).forEach(type => {
+    output += addAssertHelper(type);
+  });
+
+  Object.keys(definitions.DEPRECATED_KEYS).forEach(type => {
+    const newType = definitions.DEPRECATED_KEYS[type];
+    output += `export function assert${type}(node: Object, opts: Object): void {
+  console.trace("The node type ${type} has been renamed to ${newType}");
+  assert("${type}", node, opts);
+}\n`;
+  });
+
+  return output;
+};

packages/babel-types/scripts/generators/generateBuilders.js

@@ -0,0 +1,28 @@
+"use strict";
+const definitions = require("../../lib/definitions");
+const lowerFirst = require("../utils/lowerFirst");
+
+module.exports = function generateBuilders() {
+  let output = `// @flow
+/*
+ * This file is auto-generated! Do not modify it directly.
+ * To re-generate run 'make build'
+ */
+import builder from "../builder";\n\n`;
+
+  Object.keys(definitions.BUILDER_KEYS).forEach(type => {
+    output += `export function ${type}(...args: Array<any>): Object { return builder("${type}", ...args); }
+export { ${type} as ${lowerFirst(type)} };\n`;
+  });
+
+  Object.keys(definitions.DEPRECATED_KEYS).forEach(type => {
+    const newType = definitions.DEPRECATED_KEYS[type];
+    output += `export function ${type}(...args: Array<any>): Object {
+  console.trace("The node type ${type} has been renamed to ${newType}");
+  return ${type}("${type}", ...args);
+}
+export { ${type} as ${lowerFirst(type)} };\n`;
+  });
+
+  return output;
+};

packages/babel-types/scripts/generators/generateConstants.js

@@ -0,0 +1,17 @@
+"use strict";
+const definitions = require("../../lib/definitions");
+
+module.exports = function generateConstants() {
+  let output = `// @flow
+/*
+ * This file is auto-generated! Do not modify it directly.
+ * To re-generate run 'make build'
+ */
+import { FLIPPED_ALIAS_KEYS } from "../../definitions";\n\n`;
+
+  Object.keys(definitions.FLIPPED_ALIAS_KEYS).forEach(type => {
+    output += `export const ${type.toUpperCase()}_TYPES = FLIPPED_ALIAS_KEYS["${type}"];\n`;
+  });
+
+  return output;
+};

packages/babel-types/scripts/generators/generateValidators.js

@@ -0,0 +1,35 @@
+"use strict";
+const definitions = require("../../lib/definitions");
+
+function addIsHelper(type) {
+  return `export function is${type}(node: Object, opts?: Object): boolean {
+    return is("${type}", node, opts) }
+  `;
+}
+
+module.exports = function generateValidators() {
+  let output = `// @flow
+/*
+ * This file is auto-generated! Do not modify it directly.
+ * To re-generate run 'make build'
+ */
+import is from "../is";\n\n`;
+
+  Object.keys(definitions.VISITOR_KEYS).forEach(type => {
+    output += addIsHelper(type);
+  });
+
+  Object.keys(definitions.FLIPPED_ALIAS_KEYS).forEach(type => {
+    output += addIsHelper(type);
+  });
+
+  Object.keys(definitions.DEPRECATED_KEYS).forEach(type => {
+    const newType = definitions.DEPRECATED_KEYS[type];
+    output += `export function is${type}(node: Object, opts: Object): boolean {
+  console.trace("The node type ${type} has been renamed to ${newType}");
+  return is("${type}", node, opts);
+}\n`;
+  });
+
+  return output;
+};

packages/babel-types/scripts/utils/formatCode.js

@@ -0,0 +1,9 @@
+"use strict";
+const prettier = require("prettier");
+
+module.exports = function formatCode(code, filename) {
+  filename = filename || __filename;
+  const prettierConfig = prettier.resolveConfig.sync(filename);
+
+  return prettier.format(code, prettierConfig);
+};

packages/babel-types/scripts/utils/lowerFirst.js

@@ -0,0 +1,4 @@
+"use strict";
+module.exports = function lowerFirst(string) {
+  return string[0].toLowerCase() + string.slice(1);
+};