Converts all module specifiers within a directory to relative paths.

transform-to-relative-module-specifiers.ts

// untested...
import { Project, SyntaxKind } from "ts-simple-ast";

const project = new Project({ tsConfigFilePath: "tsconfig.json" });
const srcDir = project.getDirectoryOrThrow("./src");

for (const sourceFile of project.getSourceFiles().filter(s => srcDir.isAncestorOf(s))) {
    for (const dec of [...sourceFile.getImportDeclarations(), ...sourceFile.getExportDeclarations()]) {
        const moduleSpecifierSourceFile = dec.getModuleSpecifierSourceFile();
        if (moduleSpecifierSourceFile == null || !srcDir.isAncestorOf(moduleSpecifierSourceFile))
            continue;

        const newSpecifierValue = sourceFile.getRelativePathAsModuleSpecifierTo(moduleSpecifierSourceFile);
        if (newSpecifierValue === dev.getModuleSpecifierValue())
            continue;

        console.log(`Updating ${dev.getModuleSpecifierValue()} to ${newSpecifierValue}`);
        dec.setModuleSpecifier(sourceFile.getRelativePathAsModuleSpecifierTo(moduleSpecifierSourceFile));
    }
}

project.save().then(() => console.log("done"));