Issue with TypeScript compilation: Build error occurred because an asynchronous function or method in ES5/ES3 needs the 'Promise' constructor

I'm currently using VS2017 and TypeScript 2.5.3.

The .ts code I'm working with is as follows:

class LossEnergyCalculation {

    async initLossEnergyCalculation(): Promise<void> {
        try {
            const response = await fetch("/LossEnergyCalculation/GetOilFieldList");
            const oilFieldsData = await response.json();
    }
    ...
}

In the project's properties under the TypeScript Build section, I have configured it as follows:

TypeScript version: 2.5
ECMAScript version: ECMAScript 5
JSX compilation in TSX files: None
Module System: CommonJS

I do not have a tsconfig.json file in this project.

When I try to build the project, I encounter the following error message:

Build:An async function or method in ES5/ES3 requires the 'Promise' constructor. Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your `--lib` option.

Any suggestions on how to resolve this error would be greatly appreciated.

typescript

Answer №1

In order to incorporate the necessary Promise declarations, it is imperative that you specify the lib option. Additionally, if your runtime environment lacks built-in support for promises, you will also require a library for promises at runtime.

To delineate the libraries required, a tsconfig.json file must be used. Based on the details provided in your query, the configuration should align with your current setup:

{
  "compilerOptions": {
    "module": "commonjs",
    "sourceMap": true,
    "target": "es5",
    "lib": [ "es2015.promise", "es5", "dom" ]
  }
}

NOTE Only the es2015.promise from es2015 has been included, along with es5 for other runtime declarations. This ensures exclusion of features from es2015 that are unnecessary while providing only the essential promises. It is important to note that including the es2015.promise lib does not guarantee the presence of promises in the runtime environment; this aspect must be managed separately.

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