When working with Typescript, the error "Unable to locate type 'require'" may be encountered

I am attempting to incorporate the type definition file available at https://www.npmjs.com/package/diff-match-patch into my Angularjs project.

Just a heads up: I am working with Visual Studio as my IDE

var DiffMatchPatch = require('diff-match-patch'); <- The error is appearing here
var dmp = new DiffMatchPatch();
app.constant("dmp",dmp);

However, I am encountering the following error:

Cannot find name 'require'

This is the structure of the type definition file:

declare module "diff-match-patch" {
    type Diff = [number, string];

    export class diff_match_patch {
        static new (): diff_match_patch;

        Diff_Timeout: number;
        Diff_EditCost: number;
        Match_Threshold: number;
        Match_Distance: number;
        Patch_DeleteThreshold: number;
        Patch_Margin: number;
        Match_MaxBits: number;

        diff_main(text1: string, text2: string, opt_checklines?: boolean, opt_deadline?: number): Diff[];
        diff_commonPrefix(text1: string, text2: string): number;
        diff_commonSuffix(text1: string, text2: string): number;
        diff_cleanupSemantic(diffs: Diff[]): void;
        diff_cleanupSemanticLossless(diffs: Diff[]): void;
        diff_cleanupEfficiency(diffs: Diff[]): void;
        diff_cleanupMerge(diffs: Diff[]): void;
        diff_xIndex(diffs: Diff[], loc: number): number;
        diff_prettyHtml(diffs: Diff[]): string;
        diff_text1(diffs: Diff[]): string;
        diff_text2(diffs: Diff[]): string;
        diff_levenshtein(diffs: Diff[]): number;
        diff_toDelta(diffs: Diff[]): string;
        diff_fromDelta(text1: string, delta: string): Diff[];
    }

    export var DIFF_DELETE: number;
    export var DIFF_INSERT: number;
    export var DIFF_EQUAL: number;
}

Answer №1

In order to incorporate the type definition file https://www.npmjs.com/package/diff-match-patch into my project (Angularjs), I am following the instructions provided in the link.

If you are utilizing the npm module file on the frontend, it is necessary to employ tools like webpack and compile using --module commonjs.

Furthermore, make sure to use import/require instead of var/require. More information can be found here: https://basarat.gitbooks.io/typescript/content/docs/project/modules.html

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