Recently encountered this issue in an Angular demo hosted on plunker where SystemJS is used to transpile TypeScript code directly in the browser.
The code was flawless and operated smoothly on my local system.
The issue at hand is not related to Angular, but rather pertains to transpiling specific types of TypeScript files within a browser environment.
In my particular situation, I was able to pinpoint the root cause to a solitary file that solely contained an abstract class declaration.
// This class serves as a minimal logger interface with limited visibility of actual implementation details
export abstract class MinimalLogger {
logs: string[];
logInfo: (msg: string) => void;
}
The problem arises from the fact that this file fails to export anything else besides the abstract class itself.
To resolve this issue, simply add a dummy export statement for something tangible like so:
export const _ = 0; // workaround: requires exporting a concrete entity
A similar scenario occurred with a different file that exclusively exported TypeScript interfaces, necessitating the inclusion of at least one substantial item.
Additional Context:
SystemJS Configuration Example:
System.config({
// FOR DEMO PURPOSES ONLY! AVOID TRANSPILED CODE IN BROWSER ENVIRONMENTS
transpiler: 'ts',
typescriptOptions: {
"target": "es5",
"module": "commonjs",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"lib": ["es2015", "dom"],
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true
},
meta: {
'typescript': {
"exports": "ts"
}
},
...
})
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