change "mode strict" to "use strict" (#1275)

Author: erwinmombay

packages/core/spec/lib/OneBehindFetchSpec.js

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-'mode strict';
+'use strict';
 
 const oneBehindFetch = require('../../lib/oneBehindFetch.js');
 const mockFetch = require('fetch-mock');

packages/optimizer/build/downloadRuntimeParameters.js

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-'mode strict';
+'use strict';
 
 const RuntimeVersion = require('@ampproject/toolbox-runtime-version/lib/RuntimeVersion');
 const fetch = require('node-fetch');

packages/optimizer/lib/AmpConstants.js

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-'mode strict';
+'use strict';
 
 const {hasAttribute} = require('./NodeUtils');
 

packages/optimizer/lib/Extensions.js

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-'mode strict';
+'use strict';
 
 module.exports = {
   isRenderDelayingExtension: function (script) {

packages/optimizer/lib/fetchRuntimeParameters.js

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-'mode strict';
+'use strict';
 
 const URL_COMPONENT_VERSIONS =
   'https://raw.githubusercontent.com/ampproject/amphtml/main/build-system/compile/bundles.config.extensions.json';

packages/optimizer/spec/helpers/Utils.js

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-'mode strict';
+'use strict';
 
 const {join} = require('path');
 const {lstatSync, readdirSync, readFileSync, writeFileSync} = require('fs');