Function buildMessage

internal/build_message.ts:109–147

(
  diffResult: ReadonlyArray<DiffResult<string>>,
  options: BuildMessageOptions = {},
  truncateDiff?: (
    diffResult: ReadonlyArray<DiffResult<string>>,
    stringDiff: boolean,
    contextLength?: number | null,
  ) => ReadonlyArray<DiffResult<string>>,
)

 * ```
 */
export function buildMessage(
  diffResult: ReadonlyArray<DiffResult<string>>,
  options: BuildMessageOptions = {},
  truncateDiff?: (
    diffResult: ReadonlyArray<DiffResult<string>>,
    stringDiff: boolean,
    contextLength?: number | null,
  ) => ReadonlyArray<DiffResult<string>>,
): string[] {
  if (truncateDiff != null) {
    diffResult = truncateDiff(diffResult, options.stringDiff ?? false);
  }

  const { stringDiff = false } = options;
  const messages = [
    "",
    "",
    `    ${gray(bold("[Diff]"))} ${red(bold("Actual"))} / ${
      green(bold("Expected"))
    }`,
    "",
    "",
  ];
  const diffMessages = diffResult.map((result) => {
    const color = createColor(result.type);

    const line = result.type === "added" || result.type === "removed"
      ? result.details?.map((detail) =>
        detail.type !== "common"
          ? createColor(detail.type, true)(detail.value)
          : detail.value
      ).join("") ?? result.value
      : result.value;

    return color(`${createSign(result.type)}${line}`);
  });
  messages.push(...(stringDiff ? [diffMessages.join("")] : diffMessages), "");
  return messages;
}