Function ingestDeferBlock

packages/compiler/src/template/pipeline/src/ingest.ts:652–766

(unit: ViewCompilationUnit, deferBlock: t.DeferredBlock)

}

function ingestDeferBlock(unit: ViewCompilationUnit, deferBlock: t.DeferredBlock): void {
  let ownResolverFn: o.Expression | null = null;

  if (unit.job.deferMeta.mode === DeferBlockDepsEmitMode.PerBlock) {
    if (!unit.job.deferMeta.blocks.has(deferBlock)) {
      throw new Error(
        `AssertionError: unable to find a dependency function for this deferred block`,
      );
    }
    ownResolverFn = unit.job.deferMeta.blocks.get(deferBlock) ?? null;
  }

  // Generate the defer main view and all secondary views.
  const main = ingestDeferView(
    unit,
    '',
    deferBlock.i18n,
    deferBlock.children,
    deferBlock.sourceSpan,
  )!;
  const loading = ingestDeferView(
    unit,
    'Loading',
    deferBlock.loading?.i18n,
    deferBlock.loading?.children,
    deferBlock.loading?.sourceSpan,
  );
  const placeholder = ingestDeferView(
    unit,
    'Placeholder',
    deferBlock.placeholder?.i18n,
    deferBlock.placeholder?.children,
    deferBlock.placeholder?.sourceSpan,
  );
  const error = ingestDeferView(
    unit,
    'Error',
    deferBlock.error?.i18n,
    deferBlock.error?.children,
    deferBlock.error?.sourceSpan,
  );

  // Create the main defer op, and ops for all secondary views.
  const deferXref = unit.job.allocateXrefId();
  const deferOp = ir.createDeferOp(
    deferXref,
    main.xref,
    main.handle,
    ownResolverFn,
    unit.job.allDeferrableDepsFn,
    deferBlock.sourceSpan,
  );
  deferOp.placeholderView = placeholder?.xref ?? null;
  deferOp.placeholderSlot = placeholder?.handle ?? null;
  deferOp.loadingSlot = loading?.handle ?? null;
  deferOp.errorSlot = error?.handle ?? null;
  deferOp.placeholderMinimumTime = deferBlock.placeholder?.minimumTime ?? null;
  deferOp.loadingMinimumTime = deferBlock.loading?.minimumTime ?? null;