Function updateSnapshots

testing/unstable_snapshot.ts:95–161

()

const updateRequests: SnapshotUpdateRequest[] = [];

function updateSnapshots() {
  if (updateRequests.length === 0) return;

  if (!LINT_SUPPORTED) {
    throw new Error(
      "Deno versions before 2.2.0 do not support Deno.lint, which is required to update inline snapshots",
    );
  }

  const pathsToUpdate = Map.groupBy(updateRequests, (r) => r.fileName);

  for (const [path, updateRequests] of pathsToUpdate) {
    const snapshotsUpdated = updateRequests.length;

    const file = Deno.readTextFileSync(path);
    const pluginRunResults = Deno.lint.runPlugin(
      makeSnapshotUpdater(updateRequests),
      "dummy.ts",
      file,
    );

    const fixes = pluginRunResults.flatMap((v) => v.fix ?? []);
    if (fixes.length !== snapshotsUpdated) {
      throw new Error(
        `assertInlineSnapshot expected to update ${snapshotsUpdated} ${
          snapshotsUpdated === 1 ? "snapshot" : "snapshots"
        } in ${path} but generated ${fixes.length}`,
      );
    }

    // Apply the fixes in order
    fixes.sort((a, b) => a.range[0] - b.range[0]);
    let output = "";
    let lastIndex = 0;
    for (const fix of fixes) {
      output += file.slice(lastIndex, fix.range[0]);
      output += "`" + escapeStringForJs(fix.text ?? "") + "`";
      lastIndex = fix.range[1];
    }
    output += file.slice(lastIndex);

    Deno.writeTextFileSync(path, output);
  }

  const shouldFormat = !Deno.args.some((arg) => arg === "--no-format");
  if (shouldFormat) {
    const command = new Deno.Command(Deno.execPath(), {
      args: ["fmt", ...pathsToUpdate.keys()],
    });
    const { stderr, success } = command.outputSync();
    if (!success) {
      throw new Error(
        `assertInlineSnapshot errored while formatting ${path}:\n${
          new TextDecoder().decode(stderr)
        }`,
      );
    }
  }