Function toStylingKeyValueArray

packages/core/src/render3/instructions/styling.ts:721–753

(
  keyValueArraySet: (keyValueArray: KeyValueArray<any>, key: string, value: any) => void,
  stringParser: (styleKeyValueArray: KeyValueArray<any>, text: string) => void,
  value: string | string[] | Set<string> | {[key: string]: any} | SafeValue | null | undefined,
)

 * @param value The value to parse/convert to `KeyValueArray`
 */
export function toStylingKeyValueArray(
  keyValueArraySet: (keyValueArray: KeyValueArray<any>, key: string, value: any) => void,
  stringParser: (styleKeyValueArray: KeyValueArray<any>, text: string) => void,
  value: string | string[] | Set<string> | {[key: string]: any} | SafeValue | null | undefined,
): KeyValueArray<any> {
  if (value == null /*|| value === undefined */ || value === '') return EMPTY_ARRAY as any;
  const styleKeyValueArray: KeyValueArray<any> = [] as any;
  const unwrappedValue = unwrapSafeValue(value) as
    string | string[] | Set<string> | {[key: string]: any};
  if (Array.isArray(unwrappedValue)) {
    for (let i = 0; i < unwrappedValue.length; i++) {
      keyValueArraySet(styleKeyValueArray, unwrappedValue[i], true);
    }
  } else if (unwrappedValue instanceof Set) {
    for (const current of unwrappedValue) {
      keyValueArraySet(styleKeyValueArray, current, true);
    }
  } else if (typeof unwrappedValue === 'object') {
    for (const key in unwrappedValue) {
      if (Object.hasOwn(unwrappedValue, key)) {
        keyValueArraySet(styleKeyValueArray, key, unwrappedValue[key]);
      }
    }
  } else if (typeof unwrappedValue === 'string') {
    stringParser(styleKeyValueArray, unwrappedValue);
  } else {
    ngDevMode &&
      throwError(
        'Unsupported styling type: ' + typeof unwrappedValue + ' (' + unwrappedValue + ')',
      );
  }
  return styleKeyValueArray;
}

/**
 * Set a `value` for a `key`.