perf(betterer 🏎): only check changed ts files

goldens/api/@betterer/tsquery.d.ts

@@ -1 +1,3 @@
 export declare function tsquery(configFilePath: string, query: string): BettererFileTest;
+
+export declare function tsqueryΔ(query: string): BettererFileTest;

goldens/api/@betterer/typescript.d.ts

@@ -1 +1,3 @@
 export declare function typescript(configFilePath: string, extraCompilerOptions: ts.CompilerOptions): BettererFileTest;
+
+export declare function typescriptΔ(configFilePath: string, extraCompilerOptions?: ts.CompilerOptions): BettererFileTest;

packages/tsquery/src/index.ts

@@ -1 +1 @@
-export { tsquery } from './tsquery';
+export { tsquery, tsqueryΔ } from './tsquery';

packages/tsquery/src/tsquery.ts

@@ -36,3 +36,34 @@ export function tsquery(configFilePath: string, query: string): BettererFileTest
     );
   });
 }
+
+/** @internal Definitely not stable! Please don't use! */
+export function tsqueryΔ(query: string): BettererFileTest {
+  if (!query) {
+    throw new BettererError(
+      "for `@betterer/tsquery` to work, you need to provide a query, e.g. `'CallExpression > PropertyAccessExpression'`. ❌"
+    );
+  }
+
+  const resolver = new BettererFileResolver();
+  return new BettererFileTest(resolver, async (filePaths, fileTestResult) => {
+    if (filePaths.length === 0) {
+      return;
+    }
+
+    await Promise.all(
+      filePaths.map(async (filePath) => {
+        const fileText = await fs.readFile(filePath, 'utf8');
+        const sourceFile = tsq.ast(fileText);
+        const matches = tsq.query(sourceFile, query, { visitAllChildren: true });
+        if (matches.length === 0) {
+          return;
+        }
+        const file = fileTestResult.addFile(filePath, fileText);
+        matches.forEach((match) => {
+          file.addIssue(match.getStart(), match.getEnd(), 'TSQuery match');
+        });
+      })
+    );
+  });
+}

packages/typescript/src/index.ts

@@ -1 +1 @@
-export { typescript } from './typescript';
+export { typescript, typescriptΔ } from './typescript';

packages/typescript/src/typescript.ts

@@ -1,4 +1,4 @@
-import { BettererFileResolver, BettererFileTest } from '@betterer/betterer';
+import { BettererFileGlobs, BettererFilePaths, BettererFileResolver, BettererFileTest } from '@betterer/betterer';
 import { BettererError } from '@betterer/errors';
 import * as path from 'path';
 import * as ts from 'typescript';
@@ -8,6 +8,8 @@ const NEW_LINE = '\n';
 type TypeScriptReadConfigResult = {
   config: {
     compilerOptions: ts.CompilerOptions;
+    files: BettererFilePaths;
+    include?: BettererFileGlobs;
   };
 };
 
@@ -74,3 +76,73 @@ export function typescript(configFilePath: string, extraCompilerOptions: ts.Comp
       });
   });
 }
+
+/** @internal Definitely not stable! Please don't use! */
+export function typescriptΔ(configFilePath: string, extraCompilerOptions: ts.CompilerOptions = {}): BettererFileTest {
+  if (!configFilePath) {
+    throw new BettererError(
+      "for `@betterer/typescript` to work, you need to provide the path to a tsconfig.json file, e.g. `'./tsconfig.json'`. ❌"
+    );
+  }
+
+  const resolver = new BettererFileResolver();
+  const absPath = resolver.resolve(configFilePath);
+
+  return new BettererFileTest(resolver, (filePaths, fileTestResult) => {
+    if (filePaths.length === 0) {
+      return;
+    }
+
+    const { config } = ts.readConfigFile(absPath, ts.sys.readFile.bind(ts.sys)) as TypeScriptReadConfigResult;
+    const { compilerOptions } = config;
+    const basePath = path.dirname(absPath);
+
+    const fullCompilerOptions = {
+      ...compilerOptions,
+      ...extraCompilerOptions
+    };
+    config.compilerOptions = fullCompilerOptions;
+    config.files = filePaths;
+    delete config.include;
+
+    const compilerHost = ts.createCompilerHost(fullCompilerOptions);
+    const configHost: ts.ParseConfigHost = {
+      ...compilerHost,
+      readDirectory: ts.sys.readDirectory.bind(ts.sys),
+      useCaseSensitiveFileNames: compilerHost.useCaseSensitiveFileNames()
+    };
+    const { options, fileNames } = ts.parseJsonConfigFileContent(config, configHost, basePath);
+    const incrementalHost = ts.createIncrementalCompilerHost(options);
+
+    const oldProgram = ts.readBuilderProgram(options, incrementalHost);
+    const program = oldProgram
+      ? ts.createEmitAndSemanticDiagnosticsBuilderProgram(fileNames, options, incrementalHost, oldProgram)
+      : ts.createIncrementalProgram({
+          options,
+          rootNames: fileNames,
+          host: incrementalHost
+        });
+
+    const { diagnostics } = program.emit();
+
+    const allDiagnostics = ts.sortAndDeduplicateDiagnostics([
+      ...diagnostics,
+      ...program.getConfigFileParsingDiagnostics(),
+      ...program.getOptionsDiagnostics(),
+      ...program.getSyntacticDiagnostics(),
+      ...program.getGlobalDiagnostics(),
+      ...program.getSemanticDiagnostics()
+    ]);
+
+    allDiagnostics
+      .filter(({ file, start, length }) => file && start != null && length != null)
+      .forEach((diagnostic) => {
+        const { start, length } = diagnostic as ts.DiagnosticWithLocation;
+        const source = (diagnostic as ts.DiagnosticWithLocation).file;
+        const { fileName } = source;
+        const file = fileTestResult.addFile(fileName, source.getFullText());
+        const message = ts.flattenDiagnosticMessageText(diagnostic.messageText, NEW_LINE);
+        file.addIssue(start, start + length, message);
+      });
+  });
+}

test/__snapshots__/betterer-typescript.spec.ts.snap

@@ -563,3 +563,138 @@ Error: for \`@betterer/typescript\` to work, you need to provide compiler option
 ",
 ]
 `;
+
+exports[`betterer should work with an incremental build 1`] = `
+Array [
+  "
+   / | /     _         _   _
+ '-.ooo.-'  | |__  ___| |_| |_ ___ _ __ ___ _ __
+---ooooo--- | '_ // _ / __| __/ _ / '__/ _ / '__|
+ .-'ooo'-.  | |_)|  __/ |_| ||  __/ | |  __/ |
+   / | /    |_.__//___|/__|/__/___|_|  /___|_|
+
+",
+  "
+   / | /     _         _   _
+ '-.ooo.-'  | |__  ___| |_| |_ ___ _ __ ___ _ __
+---ooooo--- | '_ // _ / __| __/ _ / '__/ _ / '__|
+ .-'ooo'-.  | |_)|  __/ |_| ||  __/ | |  __/ |
+   / | /    |_.__//___|/__|/__/___|_|  /___|_|
+
+🌟 Betterer (0ms):
+
+",
+  "
+   / | /     _         _   _
+ '-.ooo.-'  | |__  ___| |_| |_ ___ _ __ ___ _ __
+---ooooo--- | '_ // _ / __| __/ _ / '__/ _ / '__|
+ .-'ooo'-.  | |_)|  __/ |_| ||  __/ | |  __/ |
+   / | /    |_.__//___|/__|/__/___|_|  /___|_|
+
+🌟 Betterer (0ms): 1 test running...
+🤔 typescript incremental: running \\"typescript incremental\\"!
+
+",
+  "
+   / | /     _         _   _
+ '-.ooo.-'  | |__  ___| |_| |_ ___ _ __ ___ _ __
+---ooooo--- | '_ // _ / __| __/ _ / '__/ _ / '__|
+ .-'ooo'-.  | |_)|  __/ |_| ||  __/ | |  __/ |
+   / | /    |_.__//___|/__|/__/___|_|  /___|_|
+
+🌟 Betterer (0ms): 1 test running...
+✅ typescript incremental: \\"typescript incremental\\" got checked for the first time! (1 issue) 🎉
+
+",
+  "
+   / | /     _         _   _
+ '-.ooo.-'  | |__  ___| |_| |_ ___ _ __ ___ _ __
+---ooooo--- | '_ // _ / __| __/ _ / '__/ _ / '__|
+ .-'ooo'-.  | |_)|  __/ |_| ||  __/ | |  __/ |
+   / | /    |_.__//___|/__|/__/___|_|  /___|_|
+
+🎉 Betterer (0ms): 1 test done!
+✅ typescript incremental: \\"typescript incremental\\" got checked for the first time! (1 issue) 🎉
+
+",
+  "
+   / | /     _         _   _
+ '-.ooo.-'  | |__  ___| |_| |_ ___ _ __ ___ _ __
+---ooooo--- | '_ // _ / __| __/ _ / '__/ _ / '__|
+ .-'ooo'-.  | |_)|  __/ |_| ||  __/ | |  __/ |
+   / | /    |_.__//___|/__|/__/___|_|  /___|_|
+
+🎉 Betterer (0ms): 1 test done!
+✅ typescript incremental: \\"typescript incremental\\" got checked for the first time! (1 issue) 🎉
+
+1 test got checked. 🤔
+1 test got checked for the first time! 🎉
+
+",
+  "
+   / | /     _         _   _
+ '-.ooo.-'  | |__  ___| |_| |_ ___ _ __ ___ _ __
+---ooooo--- | '_ // _ / __| __/ _ / '__/ _ / '__|
+ .-'ooo'-.  | |_)|  __/ |_| ||  __/ | |  __/ |
+   / | /    |_.__//___|/__|/__/___|_|  /___|_|
+
+",
+  "
+   / | /     _         _   _
+ '-.ooo.-'  | |__  ___| |_| |_ ___ _ __ ___ _ __
+---ooooo--- | '_ // _ / __| __/ _ / '__/ _ / '__|
+ .-'ooo'-.  | |_)|  __/ |_| ||  __/ | |  __/ |
+   / | /    |_.__//___|/__|/__/___|_|  /___|_|
+
+🌟 Betterer (0ms):
+
+",
+  "
+   / | /     _         _   _
+ '-.ooo.-'  | |__  ___| |_| |_ ___ _ __ ___ _ __
+---ooooo--- | '_ // _ / __| __/ _ / '__/ _ / '__|
+ .-'ooo'-.  | |_)|  __/ |_| ||  __/ | |  __/ |
+   / | /    |_.__//___|/__|/__/___|_|  /___|_|
+
+🌟 Betterer (0ms): 1 test running...
+🤔 typescript incremental: running \\"typescript incremental\\"!
+
+",
+  "
+   / | /     _         _   _
+ '-.ooo.-'  | |__  ___| |_| |_ ___ _ __ ___ _ __
+---ooooo--- | '_ // _ / __| __/ _ / '__/ _ / '__|
+ .-'ooo'-.  | |_)|  __/ |_| ||  __/ | |  __/ |
+   / | /    |_.__//___|/__|/__/___|_|  /___|_|
+
+🌟 Betterer (0ms): 1 test running...
+✅ typescript incremental: \\"typescript incremental\\" stayed the same. (1 issue) 😐
+
+",
+  "
+   / | /     _         _   _
+ '-.ooo.-'  | |__  ___| |_| |_ ___ _ __ ___ _ __
+---ooooo--- | '_ // _ / __| __/ _ / '__/ _ / '__|
+ .-'ooo'-.  | |_)|  __/ |_| ||  __/ | |  __/ |
+   / | /    |_.__//___|/__|/__/___|_|  /___|_|
+
+🎉 Betterer (0ms): 1 test done!
+✅ typescript incremental: \\"typescript incremental\\" stayed the same. (1 issue) 😐
+
+",
+  "
+   / | /     _         _   _
+ '-.ooo.-'  | |__  ___| |_| |_ ___ _ __ ___ _ __
+---ooooo--- | '_ // _ / __| __/ _ / '__/ _ / '__|
+ .-'ooo'-.  | |_)|  __/ |_| ||  __/ | |  __/ |
+   / | /    |_.__//___|/__|/__/___|_|  /___|_|
+
+🎉 Betterer (0ms): 1 test done!
+✅ typescript incremental: \\"typescript incremental\\" stayed the same. (1 issue) 😐
+
+1 test got checked. 🤔
+1 test stayed the same. 😐
+
+",
+]
+`;

test/betterer-typescript.spec.ts

@@ -157,4 +157,77 @@ export default {
 
     await cleanup();
   });
+
+  it('should work with an incremental build', async () => {
+    const { paths, logs, resolve, cleanup, readFile, writeFile, runNames } = await createFixture(
+      'test-betterer-typescript-incremental',
+      {
+        '.betterer.ts': `
+import { typescriptΔ } from '@betterer/typescript';
+
+export default {
+  'typescript incremental': typescriptΔ('./tsconfig.json', {
+    incremental: true,
+    tsBuildInfoFile: './.betterer.tsbuildinfo'
+  }).include('./src/**/*.ts')
+};
+        `,
+        'tsconfig.json': `
+{
+  "compilerOptions": {
+    "noEmit": true,
+    "lib": ["esnext"],
+    "moduleResolution": "node",
+    "target": "ES5",
+    "typeRoots": ["../../node_modules/@types/"],
+    "resolveJsonModule": true,
+    "strict": false
+  },
+  "include": [".betterer.ts"]
+}
+        `,
+        './src/foo.ts': `
+import { bar } from './bar'; 
+
+export function foo (a: number, b: number, c:number) {
+  return bar(a * 2, b * 2, c * 2);
+}
+        `,
+        './src/bar.ts': `
+export function bar (a: number, b: number, c:number) {
+  return (a * b) ** c;
+}
+        `
+      }
+    );
+
+    const configPaths = [paths.config];
+    const resultsPath = paths.results;
+    const indexPath = resolve('./src/index.ts');
+    const buildInfoPath = resolve('./.betterer.tsbuildinfo');
+
+    await writeFile(indexPath, `import { foo } from './foo';\n\nfoo('a', 'b', 'c');`);
+
+    const newStart = new Date().getTime();
+    const newTestRun = await betterer({ configPaths, resultsPath });
+    const newTime = new Date().getTime() - newStart;
+
+    expect(runNames(newTestRun.new)).toEqual(['typescript incremental']);
+
+    const buildInfo = await readFile(buildInfoPath);
+
+    expect(buildInfo).not.toBeNull();
+
+    const sameStart = new Date().getTime();
+    const sameTestRun = await betterer({ configPaths, resultsPath });
+    const sameTime = new Date().getTime() - sameStart;
+
+    expect(sameTime).toBeLessThan(newTime);
+
+    expect(runNames(sameTestRun.same)).toEqual(['typescript incremental']);
+
+    expect(logs).toMatchSnapshot();
+
+    await cleanup();
+  });
 });

test/runner/__snapshots__/betterer-runner.spec.ts.snap

@@ -0,0 +1,29 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`betterer.runner should ignore any files outside of the scope of the tsqueryΔ tsconfig 1`] = `"// BETTERER RESULTS V2."`;
+
+exports[`betterer.runner should ignore any files outside of the scope of the typescriptΔ test glob 1`] = `"// BETTERER RESULTS V2."`;
+
+exports[`betterer.runner should run tsqueryΔ against a file 1`] = `
+"// BETTERER RESULTS V2.
+exports[\`tsquery no raw console.log\`] = {
+  value: \`{
+    \\"src/index.ts:4087252068\\": [
+      [0, 0, 11, \\"TSQuery match\\", \\"3870399096\\"]
+    ]
+  }\`
+};
+"
+`;
+
+exports[`betterer.runner should run typescriptΔ against a file 1`] = `
+"// BETTERER RESULTS V2.
+exports[\`use typescript\`] = {
+  value: \`{
+    \\"src/index.ts:1499252024\\": [
+      [2, 12, 1, \\"The left-hand side of an arithmetic operation must be of type \\\\'any\\\\', \\\\'number\\\\', \\\\'bigint\\\\' or an enum type.\\", \\"177604\\"]
+    ]
+  }\`
+};
+"
+`;