esbuild/scripts/browser/index.html

<!DOCTYPE html>
<script>
  function setupForProblemCSS(prefix) {
    // https://github.com/tailwindlabs/tailwindcss/issues/2889
    const original = `
      /* Variant 1 */
      .${prefix}-v1 { --a: ; --b: ; max-width: var(--a) var(--b); }
      .${prefix}-a { --a: 1px; }
      .${prefix}-b { --b: 2px; }

      /* Variant 2 */
      .${prefix}-v2 { max-width: var(--a, ) var(--b, ); }
      .${prefix}-a { --a: 1px; }
      .${prefix}-b { --b: 2px; }
    `
    const style = document.createElement('style')
    const test1a = document.createElement('div')
    const test1b = document.createElement('div')
    const test2a = document.createElement('div')
    const test2b = document.createElement('div')
    document.head.appendChild(style)
    document.body.appendChild(test1a)
    document.body.appendChild(test1b)
    document.body.appendChild(test2a)
    document.body.appendChild(test2b)
    test1a.className = `${prefix}-v1 ${prefix}-a`
    test1b.className = `${prefix}-v1 ${prefix}-b`
    test2a.className = `${prefix}-v2 ${prefix}-a`
    test2b.className = `${prefix}-v2 ${prefix}-b`
    return [original, css => {
      style.textContent = css
      assertStrictEqual(getComputedStyle(test1a).maxWidth, `1px`)
      assertStrictEqual(getComputedStyle(test1b).maxWidth, `2px`)
      assertStrictEqual(getComputedStyle(test2a).maxWidth, `1px`)
      assertStrictEqual(getComputedStyle(test2b).maxWidth, `2px`)
    }]
  }

  async function expectThrownError(fn, err) {
    try {
      await fn()
      throw new Error('Expected an error to be thrown')
    } catch (e) {
      assertStrictEqual(e.message, err)
    }
  }

  function assertStrictEqual(a, b) {
    if (a !== b) {
      throw new Error(`Assertion failed:
  Observed: ${JSON.stringify(a)}
  Expected: ${JSON.stringify(b)}`);
    }
  }

  async function runAllTests({ esbuild }) {
    const tests = {
      async defaultExport() {
        assertStrictEqual(typeof esbuild.version, 'string')
        assertStrictEqual(esbuild.version, esbuild.default.version)
        assertStrictEqual(esbuild.version, esbuild.default.default.version)
        assertStrictEqual(esbuild.version, esbuild.default.default.default.version)
      },

      async transformJS() {
        const { code } = await esbuild.transform('1+2')
        assertStrictEqual(code, '1 + 2;\n')
      },

      async transformTS() {
        const { code } = await esbuild.transform('1 as any + <any>2', { loader: 'ts' })
        assertStrictEqual(code, '1 + 2;\n')
      },

      async transformCSS() {
        const { code } = await esbuild.transform('div { color: red }', { loader: 'css' })
        assertStrictEqual(code, 'div {\n  color: red;\n}\n')
      },

      async problemCSSOriginal() {
        const [original, runAsserts] = setupForProblemCSS('original')
        runAsserts(original)
      },

      async problemCSSPrettyPrinted() {
        const [original, runAsserts] = setupForProblemCSS('pretty-print')
        const { code: prettyPrinted } = await esbuild.transform(original, { loader: 'css' })
        runAsserts(prettyPrinted)
      },

      async problemCSSMinified() {
        const [original, runAsserts] = setupForProblemCSS('pretty-print')
        const { code: minified } = await esbuild.transform(original, { loader: 'css', minify: true })
        runAsserts(minified)
      },

      async buildFib() {
        const fibonacciPlugin = {
          name: 'fib',
          setup(build) {
            build.onResolve({ filter: /^fib\((\d+)\)/ }, args => {
              return { path: args.path, namespace: 'fib' }
            })
            build.onLoad({ filter: /^fib\((\d+)\)/, namespace: 'fib' }, args => {
              let match = /^fib\((\d+)\)/.exec(args.path), n = +match[1]
              let contents = n < 2 ? `export default ${n}` : `
                import n1 from 'fib(${n - 1}) ${args.path}'
                import n2 from 'fib(${n - 2}) ${args.path}'
                export default n1 + n2`
              return { contents }
            })
          },
        }
        const result = await esbuild.build({
          stdin: {
            contents: `
              import x from 'fib(10)'
              module.exports = x
            `,
          },
          format: 'cjs',
          bundle: true,
          plugins: [fibonacciPlugin],
        })
        assertStrictEqual(result.outputFiles.length, 1)
        assertStrictEqual(result.outputFiles[0].path, '<stdout>')
        const code = result.outputFiles[0].text
        const answer = {}
        new Function('module', code)(answer)
        assertStrictEqual(answer.exports, 55)
      },

      async buildRelativeIssue693() {
        const result = await esbuild.build({
          stdin: {
            contents: `const x=1`,
          },
          write: false,
          outfile: 'esbuild.js',
        });
        assertStrictEqual(result.outputFiles.length, 1)
        assertStrictEqual(result.outputFiles[0].path, '/esbuild.js')
        assertStrictEqual(result.outputFiles[0].text, 'const x = 1;\n')
      },

      async watch() {
        const context = await esbuild.context({})
        try {
          await expectThrownError(context.watch, 'Cannot use the "watch" API in this environment')
        } finally {
          context.dispose()
        }
      },

      async serve() {
        const context = await esbuild.context({})
        try {
          await expectThrownError(context.serve, 'Cannot use the "serve" API in this environment')
        } finally {
          context.dispose()
        }
      },

      async esbuildBuildSync() {
        await expectThrownError(esbuild.buildSync, 'The "buildSync" API only works in node')
      },

      async esbuildTransformSync() {
        await expectThrownError(esbuild.transformSync, 'The "transformSync" API only works in node')
      },
    }

    async function runTest(test) {
      try {
        await tests[test]()
      } catch (e) {
        e.test = test
        throw e
      }
    }

    const promises = []
    for (const test in tests) {
      promises.push(runTest(test))
    }
    await Promise.all(promises)
  }

  async function loadScript(url) {
    const tag = document.createElement('script')
    document.head.appendChild(tag)
    await new Promise((resolve, reject) => {
      tag.onload = resolve
      tag.onerror = () => reject(new Error('Failed to load script: ' + url))
      tag.src = url
    })
    const esbuild = window.esbuild
    delete window.esbuild
    return esbuild
  }

  async function testStart() {
    if (!window.testBegin) window.testBegin = args => {
      const { esm, min, worker, mime, approach } = JSON.parse(args)
      console.log(`💬 config: esm=${esm}, min=${min}, worker=${worker}, mime=${mime}, approach=${approach}`)
    }

    if (!window.testEnd) window.testEnd = args => {
      if (args === null) console.log(`👍 success`)
      else {
        const { test, stack, error } = JSON.parse(args)
        console.log(`❌ error${test ? ` [${test}]` : ``}: ${error}`)
      }
    }

    if (!window.testDone) window.testDone = error => {
      console.log(`✅ done`)
    }

    for (const esm of [false, true]) {
      for (const min of [false, true]) {
        for (const worker of [false, true]) {
          for (const mime of ['correct', 'incorrect']) {
            for (const approach of ['string', 'url', 'module']) {
              try {
                testBegin(JSON.stringify({ esm, min, worker, mime, approach }))
                const esbuild = esm
                  ? await import('/npm/esbuild-wasm/esm/browser' + (min ? '.min' : '') + '.js?' + Math.random())
                  : await loadScript('/npm/esbuild-wasm/lib/browser' + (min ? '.min' : '') + '.js?' + Math.random())
                const url = mime === 'correct' ? '/npm/esbuild-wasm/esbuild.wasm' : '/scripts/browser/esbuild.wasm.bagel'
                const initializePromise = {
                  string: () => esbuild.initialize({ wasmURL: url, worker }),
                  url: () => esbuild.initialize({ wasmURL: new URL(url, location.href), worker }),
                  module: () => fetch(url)
                    .then(r => r.arrayBuffer())
                    .then(bytes => WebAssembly.compile(bytes))
                    .then(module => esbuild.initialize({ wasmModule: module, worker })),
                }[approach]()
                await initializePromise
                await runAllTests({ esbuild })
                testEnd(null)
              } catch (e) {
                testEnd(JSON.stringify({
                  test: e.test || null,
                  stack: e.stack || null,
                  error: (e && e.message || e) + '',
                }))
              }
            }
          }
        }
      }
    }

    testDone()
  }

  testStart()

</script>