![]() Here, the view/file2 module is located in the view directory, and nav/file3 is in the components directory. ![]() │ ├── file1.ts (imports 'view/file2' and 'nav/file3') Let’s consider the following project configuration: projectRoot Our second common TypeScript module issue also has to do with location. A structured directory also makes locating necessary files easier for engineers. It is important to maintain a structured project directory as this makes it easy for the compiler to get the required file/module it needs. When we use this configuration, the TypeScript compiler will search for the node_modules directory in the root directory of the project. "baseUrl": ".", // This must be specified if "paths" is. Alternatively, the configuration below is also valid: // tsconfig.json When we use this configuration, the TypeScript compiler “jumps” up a directory from the src directory and locates the node_modules directory. "express": // This mapping is relative to "baseUrl" "baseUrl": "./src", // This must be specified if "paths" is. Therefore, our configuration should be as follows: // tsconfig.json The mapping in "paths" is resolved relative to "baseUrl". Solution 1: Locating the correct directory Here’s what’s happening under the hood: The TypeScript compiler searches for node_modules in the src directory even though node_modules is located outside the src directory, thereby determining that the module was not found. However, with the above configuration, the TypeScript compiler will throw the following error: Loaders such as webpack use a mapping configuration to map the module name (in this case, express) to the index.js file at runtime, thereby translating the snippet above to node_modules/express/lib/express at runtime.Īt this point, when we use the translated snippet above in a TypeScript project, we must then configure the TypeScript compiler to handle the module import using the "paths" property: // tsconfig.json As an example, take a look at the following JavaScript code: // index.js However, sometimes modules are not directly located under baseUrl. On a normal occasion, the node-modules directory is usually located in the root directory (i.e., baseUrl) of the project as shown below: projectRoot ![]() Problem 1: Irregular location of dependencies A firm understanding of the TypeScript modules system.A strong background in JavaScript and TypeScript.To follow along with this article, it is recommended that you have: TypeScript resolving modules by default.How TypeScript handles module resolution. ![]() Problem 3: Ambiguous module declarations.Solution 2: Locating the module and resolve imports.Solution 1: Locating the correct directory.Problem 1: Irregular location of dependencies.In this article, we’ll cover the following problems and their solutions: This is often because these configurations require understanding the TypeScript compiler and module system.ĭrawing from my experience with TypeScript projects, I’ve identified the most common issues associated with TypeScript modules and, more importantly, how to resolve them effectively. Editor’s note: This article was last updated on 7 September 2023 to include information about the “ambiguous module declarations” TypeScript error.īuild processes in TypeScript can be difficult to achieve, especially when manually configuring a project through the tsconfig.json file.
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