How to declare a pipe globally to use in different modules?

In Angular a good technique for sharing common directives, components, pipes, etc. is to use a so called shared module.

Those modules declare and export common parts, to make them usable for any of your other modules.

The fundamentals section of the angular documentation is a very good read about shared modules.

Let’s take as example your currConvert pipe.

• Declare new NgModule called ApplicationPipesModule

• Add the pipe to the declarations and exports arrays of the NgModule-decorator metadata

• Add any modules that may be required for your pipe to work to the
  imports array

  // application-pipes.module.ts
  // other imports
  import { CurrConvertPipe } from './{your-path}';
  
  @NgModule({
    imports: [
      // dep modules
    ],
    declarations: [ 
      CurrConvertPipe
    ],
    exports: [
      CurrConvertPipe
    ]
  })
  export class ApplicationPipesModule {}
  

• import the created ApplicationPipesModule module into the modules where your pipe is going to be used, by adding it to the imports array

  // my-module1.module.ts
  // other imports
  import { ApplicationPipesModule } from './{your-path}';   
  
  @NgModule({
   imports: [
     // other dep modules
     ApplicationPipesModule
   ],
   declarations: [],
   exports: []
  })
  export class MyModule1 {}