if (initialValue) {
    this.setInputValue(propName, initialValue);
} else {
    // Keep track of inputs that were not initialized in case we need to know this for
    // calling ngOnChanges with SimpleChanges
    this.uninitializedInputs.add(propName);
}

Angular CLI: 7.3.9
Node: 10.14.2
OS: darwin x64
Angular: 7.2.15
... animations, common, compiler, compiler-cli, core, elements
... forms, http, language-service, platform-browser
... platform-browser-dynamic, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.13.9
@angular-devkit/build-angular     0.13.9
@angular-devkit/build-optimizer   0.13.9
@angular-devkit/build-webpack     0.13.9
@angular-devkit/core              7.3.9
@angular-devkit/schematics        7.3.9
@angular/cdk                      7.2.2
@angular/cli                      7.3.9
@ngtools/webpack                  7.3.9
@schematics/angular               7.3.9
@schematics/update                0.13.9
rxjs                              6.4.0
typescript                        3.2.4
webpack                           4.29.0