Function makeProgramFromGraph

packages/compiler-cli/src/ngtsc/cycles/test/util.ts:37–67

(
  fs: PathManipulation,
  graph: string,
)

 * An import can be suffixed with ! to make it a type-only import.
 */
export function makeProgramFromGraph(
  fs: PathManipulation,
  graph: string,
): {
  program: ts.Program;
  host: ts.CompilerHost;
  options: ts.CompilerOptions;
} {
  const files: TestFile[] = graph.split(';').map((fileSegment) => {
    const [name, importList] = fileSegment.split(':');
    const contents =
      (importList ? importList.split(',') : [])
        .map((i) => {
          if (i.startsWith('*')) {
            const sym = i.slice(1);
            return `export {${sym}} from './${sym}';`;
          } else if (i.endsWith('!')) {
            const sym = i.slice(0, -1);
            return `import type {${sym}} from './${sym}';`;
          } else {
            return `import {${i}} from './${i}';`;
          }
        })
        .join('\n') + `export const ${name} = '${name}';\n`;
    return {
      name: fs.resolve(`/${name}.ts`),
      contents,
    };
  });
  return makeProgram(files);
}

export function importPath(files: ts.SourceFile[]): string {
  const fs = getFileSystem();