Completed

2021-07-21 23:37:51 -04:00 · 2021-07-21 23:37:51 -04:00 · 4c8f3424ce
commit 4c8f3424ce
parent 2c504997af
23 changed files with 602 additions and 34 deletions
--- a/.gitignore
+++ b/.gitignore
@ -1,2 +1,4 @@
 node_modules
 mochawesome-report
+snapshots.d.ts
+lib
--- a/.mocharc.json
+++ b/.mocharc.json
@ -2,6 +2,6 @@
  "$schema": "https://json.schemastore.org/mocharc",
  "reporter": "mochawesome",
  "extension": [".ts"],
-  "require": ["ts-node/register"],
+  "require": ["./scripts/babel-register.js"],
  "timeout": 10000
 }
--- a/README.md
+++ b/README.md
@ -0,0 +1,3 @@
+# babel-decorators
+
+Emit beautiful looking transpiled code for decorators like `tsc`.
--- a/package.json
+++ b/package.json
@ -1,13 +1,17 @@
 {
  "name": "babel-decorators",
-  "version": "1.0.0",
+  "version": "0.1.0",
  "main": "index.js",
  "license": "MIT",
  "scripts": {
-    "test": "mocha test/**/*.ts"
+    "test": "mocha test/**/*.ts",
+    "postinstall": "mkdir -p lib; cd test/snapshots && ls | sed \"s/.*/'&'/\" | paste -sd '|' | sed -e \"s/^/export type Snapshot = /\" - > ../snapshots.d.ts"
  },
  "devDependencies": {
    "@babel/core": "^7.14.8",
+    "@babel/plugin-transform-modules-commonjs": "^7.14.5",
+    "@babel/preset-typescript": "^7.14.5",
+    "@babel/register": "^7.14.5",
    "@babel/types": "^7.14.8",
    "@types/babel__core": "^7.1.15",
    "@types/chai": "^4.2.21",
@ -20,5 +24,13 @@
    "prettier": "^2.3.2",
    "ts-node": "^10.1.0",
    "typescript": "^4.3.5"
+  },
+  "prettier": {
+    "arrowParens": "avoid",
+    "tabWidth": 2,
+    "printWidth": 90,
+    "semi": false,
+    "singleQuote": false,
+    "trailingComma": "es5"
  }
 }
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@ -2,6 +2,9 @@ lockfileVersion: 5.3

 specifiers:
  '@babel/core': ^7.14.8
+  '@babel/plugin-transform-modules-commonjs': ^7.14.5
+  '@babel/preset-typescript': ^7.14.5
+  '@babel/register': ^7.14.5
  '@babel/types': ^7.14.8
  '@types/babel__core': ^7.1.15
  '@types/chai': ^4.2.21
@ -17,6 +20,9 @@ specifiers:

 devDependencies:
  '@babel/core': 7.14.8
+  '@babel/plugin-transform-modules-commonjs': 7.14.5_@babel+core@7.14.8
+  '@babel/preset-typescript': 7.14.5_@babel+core@7.14.8
+  '@babel/register': 7.14.5_@babel+core@7.14.8
  '@babel/types': 7.14.8
  '@types/babel__core': 7.1.15
  '@types/chai': 4.2.21
@ -76,6 +82,13 @@ packages:
      source-map: 0.5.7
    dev: true

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+    engines: {node: '>=6.9.0'}
+    dependencies:
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+    dev: true
+
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@ -89,6 +102,23 @@ packages:
      semver: 6.3.0
    dev: true

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+      '@babel/helper-function-name': 7.14.5
+      '@babel/helper-member-expression-to-functions': 7.14.7
+      '@babel/helper-optimise-call-expression': 7.14.5
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+      '@babel/helper-split-export-declaration': 7.14.5
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+
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@ -149,6 +179,11 @@ packages:
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    dev: true

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@ -211,6 +246,73 @@ packages:
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+
+  /pirates/4.0.1:
+    resolution: {integrity: sha512-WuNqLTbMI3tmfef2TKxlQmAiLHKtFhlsCZnPIpuv2Ow0RDVO8lfy1Opf4NUzlMXLjPl+Men7AuVdX6TA+s+uGA==}
+    engines: {node: '>= 6'}
+    dependencies:
+      node-modules-regexp: 1.0.0
+    dev: true
+
+  /pkg-dir/3.0.0:
+    resolution: {integrity: sha512-/E57AYkoeQ25qkxMj5PBOVgF8Kiu/h7cYS30Z5+R7WaiCCBfLq58ZI/dSeaEKb9WVJV5n/03QwrN3IeWIFllvw==}
+    engines: {node: '>=6'}
+    dependencies:
+      find-up: 3.0.0
+    dev: true
+
  /prettier/2.3.2:
    resolution: {integrity: sha512-lnJzDfJ66zkMy58OL5/NY5zp70S7Nz6KqcKkXYzn2tMVrNxvbqaBpg7H3qHaLxCJ5lNMsGuM8+ohS7cZrthdLQ==}
    engines: {node: '>=10.13.0'}
@ -1081,6 +1313,11 @@ packages:
    resolution: {integrity: sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==}
    dev: true

+  /semver/5.7.1:
+    resolution: {integrity: sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==}
+    hasBin: true
+    dev: true
+
  /semver/6.3.0:
    resolution: {integrity: sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==}
    hasBin: true
@ -1096,6 +1333,13 @@ packages:
    resolution: {integrity: sha1-BF+XgtARrppoA93TgrJDkrPYkPc=}
    dev: true

+  /shallow-clone/3.0.1:
+    resolution: {integrity: sha512-/6KqX+GVUdqPuPPd2LxDDxzX6CAbjJehAAOKlNpqqUpAqPM6HeL8f+o3a+JsyGjn2lv0WY8UsTgUJjU9Ok55NA==}
+    engines: {node: '>=8'}
+    dependencies:
+      kind-of: 6.0.3
+    dev: true
+
  /source-map-support/0.5.19:
    resolution: {integrity: sha512-Wonm7zOCIJzBGQdB+thsPar0kYuCIzYvxZwlBa87yi/Mdjv7Tip2cyVbLj5o0cFPN4EVkuTwb3GDDyUx2DGnGw==}
    dependencies:
--- a/scripts/babel-register.js
+++ b/scripts/babel-register.js
@ -0,0 +1,5 @@
+require("@babel/register")({
+  extensions: [".js", ".jsx", ".ts", ".tsx"],
+  presets: ["@babel/preset-typescript"],
+  plugins: ["@babel/plugin-transform-modules-commonjs"],
+})
--- a/scripts/build.js
+++ b/scripts/build.js
@ -0,0 +1,18 @@
+#!/usr/bin/env node
+const fs = require("fs")
+const { format } = require("prettier")
+const babel = require("@babel/core")
+
+// Main
+const res = babel.transformFileSync("src/index.ts", {
+  presets: ["@babel/preset-typescript"],
+  plugins: ["@babel/plugin-transform-modules-commonjs"],
+})
+fs.writeFileSync("lib/index.js", format(res.code, { parser: "babel" }))
+
+// package.json
+const pkg = require("../package.json")
+delete pkg.scripts
+delete pkg.devDependencies
+delete pkg.prettier
+fs.writeFileSync("lib/package.json", JSON.stringify(pkg, null, 2))
--- a/src/index.ts
+++ b/src/index.ts
@ -1,6 +1,184 @@
-import type * as babel from "@babel/core";
+import type * as babel from "@babel/core"
+import type * as t from "@babel/types"

-export default ({ types: t }: typeof babel): babel.PluginObj => ({
-  name: "tsc-dedent",
-  visitor: {},
-});
+interface State {
+  getTSLib(): t.ImportSpecifier[]
+  getParam(): t.Identifier
+  getDecorate(): t.Identifier
+}
+
+export default ({ types: t }: typeof babel): babel.PluginObj<State> => ({
+  name: "tsc-decorators",
+  visitor: {
+    Program: {
+      enter(path, state) {
+        const getTSLib = once(() => {
+          const specifiers: t.ImportSpecifier[] = []
+          const dec = t.importDeclaration(specifiers, t.stringLiteral("tslib"))
+          path.node.body.unshift(dec)
+          return specifiers
+        })
+
+        state.getTSLib = getTSLib
+
+        const createGet = (name: string) =>
+          once(() => {
+            const specifiers = getTSLib()
+            const localID = path.scope.hasBinding(name)
+              ? path.scope.generateUidIdentifier(name)
+              : t.identifier(name)
+            specifiers.push(t.importSpecifier(localID, t.identifier(name)))
+            return localID
+          })
+
+        const getParam = createGet("__param")
+        const getDecorate = createGet("__decorate")
+
+        state.getParam = () => t.cloneNode(getParam())
+        state.getDecorate = () => t.cloneNode(getDecorate())
+      },
+    },
+
+    ClassDeclaration(path, state) {
+      const modifiers: (t.Expression | t.Statement)[] = []
+      const classDecorators: t.Expression[] = []
+      const prefixes: t.Statement[] = []
+
+      const classID = path.node.id
+
+      const isNamedExport = t.isExportNamedDeclaration(path.parent)
+      const isDefaultExport = t.isExportDefaultDeclaration(path.parent)
+
+      if (path.node.decorators) {
+        classDecorators.push(...path.node.decorators.map(d => d.expression))
+        path.node.decorators = []
+      }
+
+      for (const child of path.node.body.body) {
+        switch (child.type) {
+          case "ClassProperty":
+            if (!child.decorators) continue
+            modifiers.push(
+              t.callExpression(state.getDecorate(), [
+                t.arrayExpression(child.decorators.map(d => d.expression)),
+                t.memberExpression(classID, t.identifier("prototype")),
+                t.isIdentifier(child.key) ? t.stringLiteral(child.key.name) : child.key,
+                t.unaryExpression("void", t.numericLiteral(0)),
+              ])
+            )
+            child.decorators = null
+            break
+
+          case "ClassMethod":
+            {
+              const list: t.Expression[] = []
+              if (child.decorators) {
+                list.push(...child.decorators.map(d => d.expression))
+                child.decorators = null
+              }
+
+              child.params.forEach((param, i) => {
+                pseudoAssert(!t.isTSParameterProperty(param))
+                if (!param.decorators?.length) return
+                list.push(
+                  ...param.decorators
+                    .map(d => d.expression)
+                    .map(e =>
+                      t.callExpression(state.getParam(), [t.numericLiteral(i), e])
+                    )
+                )
+                param.decorators = null
+              })
+
+              if (child.kind === "constructor") {
+                classDecorators.push(...list)
+              } else {
+                let key: t.Expression
+                if (child.computed) {
+                  const newID = path.scope.generateUidIdentifier()
+                  prefixes.push(
+                    t.variableDeclaration("let", [t.variableDeclarator(newID)])
+                  )
+                  child.key = t.assignmentExpression("=", newID, child.key)
+                  key = newID
+                } else if (t.isIdentifier(child.key)) {
+                  key = t.stringLiteral(child.key.name)
+                } else {
+                  key = child.key
+                }
+
+                modifiers.push(
+                  t.callExpression(state.getDecorate(), [
+                    t.arrayExpression(list),
+                    t.memberExpression(classID, t.identifier("prototype")),
+                    key,
+                    t.nullLiteral(),
+                  ])
+                )
+              }
+            }
+            break
+        }
+      }
+
+      if (!classDecorators.length && !modifiers.length && !prefixes.length) return
+
+      const replacees: t.Statement[] = prefixes.slice()
+      if (classDecorators.length) {
+        replacees.push(
+          t.variableDeclaration("let", [
+            t.variableDeclarator(classID, { ...path.node, type: "ClassExpression" }),
+          ])
+        )
+        modifiers.push(
+          t.assignmentExpression(
+            "=",
+            classID,
+            t.callExpression(state.getDecorate(), [
+              t.arrayExpression(classDecorators),
+              classID,
+            ])
+          )
+        )
+
+        if (isNamedExport) {
+          modifiers.push(
+            t.exportNamedDeclaration(undefined, [t.exportSpecifier(classID, classID)])
+          )
+        } else if (isDefaultExport) {
+          modifiers.push(t.exportDefaultDeclaration(classID))
+        }
+      } else {
+        let node: t.Statement = path.node
+        if (isNamedExport) {
+          node = t.exportNamedDeclaration(node, [], null)
+        } else if (isDefaultExport) {
+          node = t.exportDefaultDeclaration(node)
+        }
+        replacees.push(node)
+      }
+
+      replacees.push(
+        ...modifiers.map(e => (t.isStatement(e) ? e : t.expressionStatement(e)))
+      )
+      const replacementTarget = isNamedExport || isDefaultExport ? path.parentPath : path
+      replacementTarget.replaceWithMultiple(replacees)
+    },
+  },
+})
+
+function pseudoAssert(condition: any): asserts condition {}
+
+const once = <T extends Function>(fn: T): T => {
+  let called = false
+  let cache: any
+  return function (this: any) {
+    if (called) {
+      return cache
+    } else {
+      cache = fn.apply(this, arguments)
+      called = true
+      return cache
+    }
+  } as any
+}
--- a/test/index.ts
+++ b/test/index.ts
@ -1,34 +1,53 @@
-import { describe, it } from "mocha";
-import { expect } from "chai";
-import { transform } from "@babel/core";
-import { format } from "prettier";
-import plugin from "../src/index";
+import { readFileSync } from "fs"
+import { describe, it } from "mocha"
+import { resolve } from "path"
+import { expect } from "chai"
+import { transform } from "@babel/core"
+import { format } from "prettier"
+import type { Snapshot } from "./snapshots"
+import plugin from "../src/index"

-const javascript = (code: TemplateStringsArray) =>
-  transform(code[0], {
+const canonize = (code: string) =>
+  format(code, { parser: "babel" }).trim().split("\n").filter(Boolean).join("\n")
+
+const equal = (name: Snapshot) => {
+  const folder = resolve(__dirname, "snapshots", name)
+  const actual = readFileSync(resolve(folder, "input.txt"), "utf-8")
+  const expected = readFileSync(resolve(folder, "output.txt"), "utf-8")
+  const transformed = transform(actual, {
    parserOpts: {
      plugins: ["decorators-legacy", "typescript"],
    },
+    babelrc: false,
+    configFile: false,
    plugins: [plugin],
-  })!.code!;
+  })!.code!
+  expect(canonize(transformed)).to.deep.equal(canonize(expected))
+}

-const canonize = (code: string) => format(code, { parser: "babel" }).trim();
+describe("tsc-decorator", () => {
+  it("works with property decorators", () => {
+    equal("properties")
+  })

-const equal = (actual: string, expected: string) => {
-  actual = canonize(actual);
-  expected = canonize(expected);
-  expect(actual).to.deep.equal(expected);
-};
+  it("works with method decorators", () => {
+    equal("methods")
+  })

-describe("", () => {
-  it("should do nothing", () => {
-    equal(
-      javascript`
-      class A {}
-    `,
-      /* javascript */ `
-      class A {}
-      `
-    );
-  });
-});
+  it("works with parameter decorators", () => {
+    equal("params")
+  })
+
+  // https://github.com/babel/babel/issues/13591
+  it.skip("works with computed property keys", () => {
+    equal("computedProperties")
+  })
+
+  it("works with class/consrtuctor decorators", () => {
+    equal("constructor")
+  })
+
+  it("does not interfere with export declarations", () => {
+    equal("exports")
+  })
+})
--- a/test/snapshots/.eslintignore
+++ b/test/snapshots/.eslintignore
@ -0,0 +1 @@
+*
--- a/test/snapshots/computedProperties/input.txt
+++ b/test/snapshots/computedProperties/input.txt
@ -0,0 +1,4 @@
+class A {
+  @decorator
+  [Symbol.iterator]() {}
+}
--- a/test/snapshots/computedProperties/output.txt
+++ b/test/snapshots/computedProperties/output.txt
@ -0,0 +1,5 @@
+let _a;
+class A {
+  [_a = Symbol.iterator]() { }
+}
+__decorate([decorator], A.prototype, _a, null);
--- a/test/snapshots/constructor/input.txt
+++ b/test/snapshots/constructor/input.txt
@ -0,0 +1,4 @@
+@classDecorator
+class A {
+  @prop string: string;
+}
--- a/test/snapshots/constructor/output.txt
+++ b/test/snapshots/constructor/output.txt
@ -0,0 +1,8 @@
+import { __decorate } from "tslib";
+
+let A = class A {
+  string: string;
+}
+
+__decorate([prop], A.prototype, "string", void 0);
+A = __decorate([classDecorator], A);
--- a/test/snapshots/exports/input.txt
+++ b/test/snapshots/exports/input.txt
@ -0,0 +1,9 @@
+export class NormalDecorated {
+  @prop a: string
+}
+
+@classDecorator
+export class ClassDecorated {}
+
+@classDecorator
+export default class DefaultExport {}
--- a/test/snapshots/exports/output.txt
+++ b/test/snapshots/exports/output.txt
@ -0,0 +1,15 @@
+import { __decorate } from "tslib";
+
+export class NormalDecorated {
+  a: string;
+}
+__decorate([prop], NormalDecorated.prototype, "a", void 0);
+
+let ClassDecorated = class ClassDecorated {};
+ClassDecorated = __decorate([classDecorator], ClassDecorated);
+
+export { ClassDecorated };
+
+let DefaultExport = class DefaultExport {};
+DefaultExport = __decorate([classDecorator], DefaultExport);
+export default DefaultExport;
--- a/test/snapshots/methods/input.txt
+++ b/test/snapshots/methods/input.txt
@ -0,0 +1,3 @@
+class A {
+  @dec method(): string {}
+}
--- a/test/snapshots/methods/output.txt
+++ b/test/snapshots/methods/output.txt
@ -0,0 +1,7 @@
+import { __decorate } from "tslib";
+
+class A {
+  method(): string {}
+}
+
+__decorate([dec], A.prototype, "method", null);
--- a/test/snapshots/params/input.txt
+++ b/test/snapshots/params/input.txt
@ -0,0 +1,6 @@
+import { __decorate } from "tslib"
+
+class A {
+  method1(skipped: string, @Arg() b: string) {}
+  method2(@Arg() a: string, @Arg() b: string) {}
+}
--- a/test/snapshots/params/output.txt
+++ b/test/snapshots/params/output.txt
@ -0,0 +1,10 @@
+import { __param, __decorate as _decorate } from "tslib";
+import { __decorate } from "tslib";
+
+class A {
+  method1(skipped: string, b: string) {}
+  method2(a: string, b: string) {}
+}
+
+_decorate([__param(1, Arg())], A.prototype, "method1", null);
+_decorate([__param(0, Arg()), __param(1, Arg())], A.prototype, "method2", null);
--- a/test/snapshots/properties/input.txt
+++ b/test/snapshots/properties/input.txt
@ -0,0 +1,4 @@
+class A {
+  @dec prop: string
+  @dec @dec2 prop2: string
+}
--- a/test/snapshots/properties/output.txt
+++ b/test/snapshots/properties/output.txt
@ -0,0 +1,9 @@
+import { __decorate } from "tslib"
+
+class A {
+  prop: string;
+  prop2: string;
+}
+
+__decorate([dec], A.prototype, "prop", void 0);
+__decorate([dec, dec2], A.prototype, "prop2", void 0);
--- a/tsconfig.json
+++ b/tsconfig.json
@ -1,5 +1,7 @@
 {
  "compilerOptions": {
+    "experimentalDecorators": true,
+    "checkJs": false,
    "strict": true,
    "noEmit": true
  }