Function runDiff

packages/serverless/lib/plugins/aws/diff/run-diff.js:37–76

* Load the locally-packaged template, fetch the deployed template, compute * the diff, and render it (text by default, JSON when `--json` is set). * * Two orthogonal signals are surfaced: * 1. Per-function code changes — computed by hashing local zips and * comparing to each La

()

   *      noise the framework already considers meaningless.
   */
  async runDiff() {
    const [newTemplate, oldTemplate] = await Promise.all([
      this._loadLocalTemplate(),
      this._fetchDeployedTemplate(),
    ])

    const codeChanges = await this._detectCodeChanges(oldTemplate)

    const diff = diffTemplate(
      normalizeForDiff(oldTemplate),
      normalizeForDiff(newTemplate),
    )
    const summary = summarizeChanges(diff)

    // The package lifecycle's "Packaging" spinner is still active when our
    // `after:package:finalize` hook fires. Stop it before writing structured
    // output to stdout, otherwise the spinner overlays the first line of the
    // diff (or interleaves with `--json` payloads on TTY consumers piping to
    // `jq`).
    this.progress.remove()

    if (this.options.json) {
      writeText(
        JSON.stringify(buildJsonReport(diff, summary, codeChanges), null, 2),
      )
      return
    }

    this._renderCodeChangeSummary(codeChanges)

    if (diff.isEmpty) {
      this.log.notice('No infrastructure changes against the deployed stack')
      return
    }

    renderDiff(process.stdout, diff)
    this.log.notice(
      `Resources: ${summary.create} to create, ${summary.update} to update, ${summary.remove} to remove`,
    )
  },

  /**
   * Read the freshly-packaged CloudFormation template from disk. Resolves