Function compileQuery

packages/compiler/src/render3/partial/directive.ts:174–204

* Compiles the metadata of a single query into its partial declaration form as declared * by `R3DeclareQueryMetadata`.

(query: R3QueryMetadata)

 * by `R3DeclareQueryMetadata`.
 */
function compileQuery(query: R3QueryMetadata): o.LiteralMapExpr {
  const meta = new DefinitionMap<R3DeclareQueryMetadata>();
  meta.set('propertyName', o.literal(query.propertyName));
  if (query.first) {
    meta.set('first', o.literal(true));
  }
  meta.set(
    'predicate',
    Array.isArray(query.predicate)
      ? asLiteral(query.predicate)
      : convertFromMaybeForwardRefExpression(query.predicate),
  );
  if (!query.emitDistinctChangesOnly) {
    // `emitDistinctChangesOnly` is special because we expect it to be `true`.
    // Therefore we explicitly emit the field, and explicitly place it only when it's `false`.
    meta.set('emitDistinctChangesOnly', o.literal(false));
  } else {
    // The linker will assume that an absent `emitDistinctChangesOnly` flag is by default `true`.
  }
  if (query.descendants) {
    meta.set('descendants', o.literal(true));
  }
  meta.set('read', query.read);
  if (query.static) {
    meta.set('static', o.literal(true));
  }
  if (query.isSignal) {
    meta.set('isSignal', o.literal(true));
  }
  return meta.toLiteralMap();
}

/**
 * Compiles the host metadata into its partial declaration form as declared