Initial prototype

- transformer
- runner with sample file
- testing infrastracture

Author: Igorbek

.gitignore

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+built/
+node_modules/
+.vscode/
+**/*.js

jest.config.json

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+{
+    "automock": false,
+    "globals": {
+        "window": {},
+        "__TS_CONFIG__": "./tsconfig.json"
+    },
+    "mapCoverage": true,
+    "moduleFileExtensions": [
+        "ts",
+        "tsx",
+        "js"
+    ],
+    "notify": false,
+    "rootDir": "./",
+    "testRegex": "\\.test\\.(ts|tsx)$",
+    "transform": {
+        "\\.(ts|tsx)$": "ts-jest/preprocessor.js"
+    },
+    "verbose": true
+}

package.json

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+{
+  "scripts": {
+    "build-run": "tsc && node ./src/runner.js",
+    "run-script": "./src/runner.js",
+    "test-baselines": "jest --config ./jest.config.json"
+  },
+  "dependencies": {
+    "jest": "^20.0.4",
+    "typescript": "^2.3.4"
+  },
+  "devDependencies": {
+    "@types/glob": "^5.0.30",
+    "@types/jest": "^19.2.4",
+    "@types/node": "^7.0.31",
+    "ts-jest": "^20.0.6"
+  }
+}

src/__tests__/__snapshots__/baselines.test.ts.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`sample1.ts 1`] = `
+
+File: sample1.ts
+Source code:
+
+  import styled from 'styled-components';
+  
+  const Button = styled.button\`
+    color: red;
+  \`;
+  
+  declare const nonStyled: any;
+  
+  const NonButton = nonStyled.button\`
+    yo
+  \`;
+  
+  const OtherButton = styled(Button)\`
+    color: blue;
+  \`;
+  
+  const SuperButton = Button.extend\`
+    color: super;
+  \`;
+  
+  export default styled.link\`
+    color: black;
+  \`;
+  
+  export const SmallButton = Button.extend\`
+    font-size: .7em;
+  \`;
+  
+
+TypeScript before transform:
+
+  import styled from "styled-components";
+  const Button = styled.button \`\\n  color: red;\\n\`;
+  declare const nonStyled: any;
+  const NonButton = nonStyled.button \`\\n  yo\\n\`;
+  const OtherButton = styled(Button) \`\\n  color: blue;\\n\`;
+  const SuperButton = Button.extend \`\\n  color: super;\\n\`;
+  export default styled.link \`\\n  color: black;\\n\`;
+  export const SmallButton = Button.extend \`\\n  font-size: .7em;\\n\`;
+  
+
+TypeScript after transform:
+
+  import styled from "styled-components";
+  const Button = styled.button \`\\n  color: red;\\n\`;
+  declare const nonStyled: any;
+  const NonButton = nonStyled.button \`\\n  yo\\n\`;
+  const OtherButton = styled(Button) \`\\n  color: blue;\\n\`;
+  const SuperButton = Button.extend \`\\n  color: super;\\n\`;
+  export default styled.link \`\\n  color: black;\\n\`;
+  export const SmallButton = Button.extend \`\\n  font-size: .7em;\\n\`;
+  
+
+
+`;

src/__tests__/baselines.test.ts

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+import 'jest';
+import * as ts from 'typescript';
+import * as fs from 'fs';
+import * as glob from 'glob';
+import transformer from '../transformer';
+
+const printer = ts.createPrinter();
+
+interface TransformBaseline {
+    type: 'transform-baseline';
+    filename: string;
+    content: string;
+    source: string;
+    transformed: string;
+}
+
+(expect as any).addSnapshotSerializer({
+    test: obj => obj && obj.type === 'transform-baseline',
+    print: (obj: TransformBaseline, print: (object: any) => string, indent: (str: string) => string) => `
+File: ${obj.filename}
+Source code:
+
+${indent(obj.content)}
+
+TypeScript before transform:
+
+${indent(obj.source)}
+
+TypeScript after transform:
+
+${indent(obj.transformed)}
+
+`
+});
+
+function expectTransform(filename: string) {
+    const content = fs.readFileSync('./src/__tests__/baselines/' + filename).toString();
+    const sourceFile = ts.createSourceFile(filename, content, ts.ScriptTarget.Latest);
+    const source = printer.printFile(sourceFile);
+    const transformedFile = ts.transform(sourceFile, [transformer]);
+    const transformed = printer.printFile(transformedFile.transformed[0]);
+
+    const snapshot: TransformBaseline = {
+        type: 'transform-baseline',
+        filename,
+        content,
+        source,
+        transformed
+    };
+
+    expect(snapshot).toMatchSnapshot();
+}
+
+const files = ['sample1.ts'];
+
+files.forEach(file => it(file, () => expectTransform(file)));

src/__tests__/baselines/package.json

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+{
+  "dependencies": {
+    "styled-components": "^2.0.1"
+  }
+}

src/__tests__/baselines/sample1.ts

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+import styled from 'styled-components';
+
+const Button = styled.button`
+  color: red;
+`;
+
+declare const nonStyled: any;
+
+const NonButton = nonStyled.button`
+  yo
+`;
+
+const OtherButton = styled(Button)`
+  color: blue;
+`;
+
+const SuperButton = Button.extend`
+  color: super;
+`;
+
+export default styled.link`
+  color: black;
+`;
+
+export const SmallButton = Button.extend`
+  font-size: .7em;
+`;

src/__tests__/baselines/tsconfig.json

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+{
+  "compilerOptions": {
+    /* Basic Options */                       
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */
+    "module": "commonjs",                     /* Specify module code generation: 'commonjs', 'amd', 'system', 'umd' or 'es2015'. */
+    // "lib": [],                             /* Specify library files to be included in the compilation:  */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    // "outDir": "./",                        /* Redirect output structure to the directory. */
+    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+                                              
+    /* Strict Type-Checking Options */        
+    "strict": true                            /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+                                              
+    /* Additional Checks */                   
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+                                              
+    /* Module Resolution Options */           
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+                                              
+    /* Source Map Options */                  
+    // "sourceRoot": "./",                    /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "./",                       /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+                                              
+    /* Experimental Options */                
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+  }
+}