Function preflightPlanOutputs

packages/migrate/src/node.ts:138–153

(plan: MigrationFilePlan, options: ApplyMigrationPlanOptions)

}

async function preflightPlanOutputs(plan: MigrationFilePlan, options: ApplyMigrationPlanOptions): Promise<void> {
  const outputRoot = resolve(plan.outputRoot);
  const canonicalOutputRoot = await canonicalFutureDirectory(outputRoot, 'outputRoot');
  const canonicalOutputs = new Set<string>();
  for (const { sourcePath, outputPath, result } of plan.files) {
    if (result.status === 'refused') throw new Error(`Migration result was refused for source: ${sourcePath}`);
    const resolvedOutputPath = resolve(outputPath);
    if (resolvedOutputPath === outputRoot) throw new Error(`Output path must identify a file below outputRoot: ${outputPath}`);
    assertContained(outputRoot, resolvedOutputPath, `Output path is outside outputRoot: ${outputPath}`);
    const canonicalOutputPath = await canonicalFuturePath(resolvedOutputPath);
    assertContained(canonicalOutputRoot, canonicalOutputPath, `Output path resolves outside outputRoot: ${outputPath}`);
    if (canonicalOutputs.has(canonicalOutputPath)) throw new Error(`Duplicate output path: ${outputPath}`);
    canonicalOutputs.add(canonicalOutputPath);
    await assertWritableOutput(resolvedOutputPath, options.overwrite ?? false);
  }
}

async function assertWritableOutput(outputPath: string, overwrite: boolean): Promise<void> {
  try {