Move typscript test copy script to scripts folder and run once (#6749)

packages/babel-generator/scripts/generate-typescript-tests.js

@@ -0,0 +1,55 @@
+/*
+Copies tests from babylon's TypeScript test suite to @babel/generator.
+*/
+const {
+  copySync,
+  emptyDirSync,
+  existsSync,
+  readdirSync,
+  readFileSync,
+} = require("fs-extra");
+const { join } = require("path");
+
+const testsFrom = join(__dirname, "../../babylon/test/fixtures/typescript");
+const testsTo = join(__dirname, "../test/fixtures/typescript");
+
+emptyDirSync(testsTo);
+
+copySync(join(testsFrom, "options.json"), join(testsTo, "options.json"));
+
+for (const groupName of readdirSync(testsFrom)) {
+  if (groupName === "options.json") continue;
+
+  const groupFromDir = join(testsFrom, groupName);
+  const testNames = readdirSync(groupFromDir);
+  const groupHasOptions = testNames.includes("options.json");
+
+  for (const testName of testNames) {
+    if (testName === "options.json") {
+      continue;
+    }
+
+    const testFromDir = join(groupFromDir, testName);
+    const testToDir = join(testsTo, `${groupName}-${testName}`);
+
+    let optionsJsonFrom;
+    const ownOptions = join(testFromDir, "options.json");
+    if (existsSync(ownOptions)) {
+      const options = JSON.parse(readFileSync(ownOptions));
+      // Don't include a test that doesn't parse or does not provide babel AST
+      if (options.throws || options.plugins.indexOf("estree") >= 0) {
+        continue;
+      }
+      optionsJsonFrom = ownOptions;
+    } else if (groupHasOptions) {
+      // Copy group options to each individual one, since we don't have groups here.
+      optionsJsonFrom = join(groupFromDir, "options.json");
+    }
+
+    emptyDirSync(testToDir);
+    if (optionsJsonFrom) {
+      copySync(optionsJsonFrom, join(testToDir, "options.json"));
+    }
+    copySync(join(testFromDir, "actual.js"), join(testToDir, "actual.js"));
+  }
+}