[tests] Pass in builder to runBuildLambda() (#9262)

Removes the need for `next`/`static-build` to be present in the root `package.json` file.

test/lib/run-build-lambda.js

@@ -4,75 +4,56 @@ const fs = require('fs-extra');
 const json5 = require('json5');
 const { glob } = require('@vercel/build-utils');
 
-function runAnalyze(wrapper, context) {
-  if (wrapper.analyze) {
-    return wrapper.analyze(context);
-  }
+exports.createRunBuildLambda = function (builder) {
+  return async inputPath => {
+    const inputFiles = await glob('**', inputPath);
+    const nowJsonRef = inputFiles['vercel.json'] || inputFiles['now.json'];
 
-  return 'this-is-a-fake-analyze-result-from-default-analyze';
-}
+    if (typeof expect !== 'undefined') {
+      expect(nowJsonRef).toBeDefined();
+    }
+    const nowJson = json5.parse(await fs.readFile(nowJsonRef.fsPath, 'utf8'));
+    const build = nowJson.builds[0];
 
-async function runBuildLambda(inputPath) {
-  const inputFiles = await glob('**', inputPath);
-  const nowJsonRef = inputFiles['vercel.json'] || inputFiles['now.json'];
+    if (typeof expect !== 'undefined') {
+      expect(build.src.includes('*')).toBeFalsy();
+    }
+    const entrypoint = build.src.replace(/^\//, ''); // strip leftmost slash
 
-  if (typeof expect !== 'undefined') {
-    expect(nowJsonRef).toBeDefined();
-  }
-  const nowJson = json5.parse(await fs.readFile(nowJsonRef.fsPath, 'utf8'));
-  const build = nowJson.builds[0];
-
-  if (typeof expect !== 'undefined') {
-    expect(build.src.includes('*')).toBeFalsy();
-  }
-  const entrypoint = build.src.replace(/^\//, ''); // strip leftmost slash
-
-  if (typeof expect !== 'undefined') {
-    expect(inputFiles[entrypoint]).toBeDefined();
-  }
-  inputFiles[entrypoint].digest =
-    'this-is-a-fake-digest-for-non-default-analyze';
-  const wrapper = require(build.use);
-
-  const analyzeResult = runAnalyze(wrapper, {
-    files: inputFiles,
-    entrypoint,
-    config: build.config,
-  });
-
-  let workPath = path.join(
-    os.tmpdir(),
-    `vercel-${Date.now()}-${Math.floor(Math.random() * 100)}`
-  );
-  await fs.ensureDir(workPath);
-
-  workPath = await fs.realpath(workPath);
-  console.log('building in', workPath);
-
-  const buildResult = await wrapper.build({
-    files: inputFiles,
-    entrypoint,
-    config: build.config,
-    workPath,
-  });
-  const { output } = buildResult;
-
-  // Windows support
-  if (output) {
-    buildResult.output = Object.keys(output).reduce(
-      (result, path) => ({
-        ...result,
-        [path.replace(/\\/g, '/')]: output[path],
-      }),
-      {}
+    if (typeof expect !== 'undefined') {
+      expect(inputFiles[entrypoint]).toBeDefined();
+    }
+    let workPath = path.join(
+      os.tmpdir(),
+      `vercel-${Date.now()}-${Math.floor(Math.random() * 100)}`
     );
-  }
+    await fs.ensureDir(workPath);
 
-  return {
-    analyzeResult,
-    buildResult,
-    workPath,
+    workPath = await fs.realpath(workPath);
+    console.log('building in', workPath);
+
+    const buildResult = await builder.build({
+      files: inputFiles,
+      entrypoint,
+      config: build.config,
+      workPath,
+    });
+    const { output } = buildResult;
+
+    // Windows support
+    if (output) {
+      buildResult.output = Object.keys(output).reduce(
+        (result, path) => ({
+          ...result,
+          [path.replace(/\\/g, '/')]: output[path],
+        }),
+        {}
+      );
+    }
+
+    return {
+      buildResult,
+      workPath,
+    };
   };
-}
-
-module.exports = runBuildLambda;
+};