#complie

Introduction

In the world of web development, TypeScript has gained immense popularity for its ability to bring static typing to JavaScript. To harness the full power of TypeScript, it is essential to configure the tsconfig.json file, particularly the compilerOptions. This article will serve as a comprehensive guide to optimizing TypeScript compilation by exploring various compiler options and their impact on the development process.

Understanding the tsconfig.json File

Before diving into the various compiler options, it's essential to understand the purpose of the tsconfig.json file. This file serves as the configuration file for TypeScript projects and allows developers to specify the compiler options, files to include or exclude, and other project-specific settings.

Setting the Target ECMAScript Version

One of the crucial decisions in the compilerOptions is choosing the target ECMAScript version. By setting the target option, developers can indicate the desired output ECMAScript version. For instance, if compatibility with older browsers is a concern, targeting ECMAScript 5 might be preferable.

Selecting Module Code Generation

The module option in the compilerOptions determines how TypeScript generates module code. Developers can choose from options like CommonJS, AMD, ES6, and more, depending on the project's requirements and the targeted environment.

Enabling Strict Type-Checking

TypeScript offers strict type-checking options that help catch potential errors at compile-time. Enabling options like strict, noImplicitAny, and strictNullChecks can enhance code quality and prevent runtime errors.

Customizing Output Paths

The outDir option allows developers to specify a custom output directory for compiled JavaScript files. This can help keep the project organized and separate the compiled files from the source code.

Bundling with Webpack

When working on large projects, bundling TypeScript files is essential for performance optimization. Developers can utilize Webpack and configure ts-loader to bundle TypeScript files efficiently.

Using Source Maps

Source maps are invaluable for debugging TypeScript code in the browser. By enabling the sourceMap option, developers can easily map the compiled JavaScript code back to the original TypeScript code, making debugging a breeze.

Using Declaration Files

TypeScript provides declaration files (.d.ts) to describe the shape of external JavaScript libraries. Developers can leverage the declaration option to generate these declaration files during compilation.

Targeting Different Environments

To target specific environments, developers can use the lib option to include different sets of TypeScript library files. This ensures that the compiled code is compatible with the chosen environment.

Handling Module Resolution

The moduleResolution option controls how TypeScript resolves module dependencies. Developers can choose between node and classic based on the project's module resolution strategy.

Optimizing for Speed

By setting the incremental option to true, TypeScript will cache the results of the compilation to boost subsequent compilation speeds. This is particularly helpful in large projects with multiple dependencies.

Including and Excluding Files

The include and exclude options allow developers to specify which files should be included or excluded from the compilation process. This can help fine-tune the scope of the TypeScript compiler.

Strictly Checking Function Parameters

The strictFunctionTypes option enforces strict checks on function types, ensuring greater type safety and avoiding potential bugs related to function compatibility.

Using Experimental Features

TypeScript continually evolves, introducing experimental features that are not part of the stable release yet. Developers can explore these features by enabling the experimentalDecorators and emitDecoratorMetadata options.

Conclusion

Configuring the compilerOptions in the tsconfig.json file is a critical step in optimizing TypeScript compilation for any project. By carefully selecting the right options, developers can enhance code quality, improve performance, and ensure better compatibility with different environments. Typescript Documentation https://www.typescriptlang.org/tsconfig

FAQs

Introduction

In the world of web development, TypeScript has gained immense popularity for its ability to bring static typing to JavaScript. To harness the full power of TypeScript, it is essential to configure the tsconfig.json file, particularly the compilerOptions. This article will serve as a comprehensive guide to optimizing TypeScript compilation by exploring various compiler options and their impact on the development process.

Understanding the tsconfig.json File

Before diving into the various compiler options, it's essential to understand the purpose of the tsconfig.json file. This file serves as the configuration file for TypeScript projects and allows developers to specify the compiler options, files to include or exclude, and other project-specific settings.

Setting the Target ECMAScript Version

One of the crucial decisions in the compilerOptions is choosing the target ECMAScript version. By setting the target option, developers can indicate the desired output ECMAScript version. For instance, if compatibility with older browsers is a concern, targeting ECMAScript 5 might be preferable.

Selecting Module Code Generation

The module option in the compilerOptions determines how TypeScript generates module code. Developers can choose from options like CommonJS, AMD, ES6, and more, depending on the project's requirements and the targeted environment.

Enabling Strict Type-Checking

TypeScript offers strict type-checking options that help catch potential errors at compile-time. Enabling options like strict, noImplicitAny, and strictNullChecks can enhance code quality and prevent runtime errors.

Customizing Output Paths

The outDir option allows developers to specify a custom output directory for compiled JavaScript files. This can help keep the project organized and separate the compiled files from the source code.

Bundling with Webpack

When working on large projects, bundling TypeScript files is essential for performance optimization. Developers can utilize Webpack and configure ts-loader to bundle TypeScript files efficiently.

Using Source Maps

Source maps are invaluable for debugging TypeScript code in the browser. By enabling the sourceMap option, developers can easily map the compiled JavaScript code back to the original TypeScript code, making debugging a breeze.

Using Declaration Files

TypeScript provides declaration files (.d.ts) to describe the shape of external JavaScript libraries. Developers can leverage the declaration option to generate these declaration files during compilation.

Targeting Different Environments

To target specific environments, developers can use the lib option to include different sets of TypeScript library files. This ensures that the compiled code is compatible with the chosen environment.

Handling Module Resolution

The moduleResolution option controls how TypeScript resolves module dependencies. Developers can choose between node and classic based on the project's module resolution strategy.

Optimizing for Speed

By setting the incremental option to true, TypeScript will cache the results of the compilation to boost subsequent compilation speeds. This is particularly helpful in large projects with multiple dependencies.

Including and Excluding Files

The include and exclude options allow developers to specify which files should be included or excluded from the compilation process. This can help fine-tune the scope of the TypeScript compiler.

Strictly Checking Function Parameters

The strictFunctionTypes option enforces strict checks on function types, ensuring greater type safety and avoiding potential bugs related to function compatibility.

Using Experimental Features

TypeScript continually evolves, introducing experimental features that are not part of the stable release yet. Developers can explore these features by enabling the experimentalDecorators and emitDecoratorMetadata options.

Conclusion

Configuring the compilerOptions in the tsconfig.json file is a critical step in optimizing TypeScript compilation for any project. By carefully selecting the right options, developers can enhance code quality, improve performance, and ensure better compatibility with different environments. Typescript Documentation https://www.typescriptlang.org/tsconfig

FAQs

Gomer Plays The Guardian Legend (Part 4: A Little Help From My Friend)

The second half of the forest sector has a corridor that requires help from the Shopkeep Lander and the first death in the game! Ending slate music: “Glitchy G Funk Summer” by teknoaxe – https://www.youtube.com/watch?v=IdZ12hFw_Ho SPECIAL THANKS to all our wonderful Patreon supporters! Elizabeth Cody David A. Scott, Jr. Timothy…

Gomer Plays The Guardian Legend (Part 3: The Erasing Begins)

In the first forest sector, Gomer comes across perhaps the greatest boon in the game: ENEMY ERASERS! Ending slate music: “Glitchy G Funk Summer” by teknoaxe – https://www.youtube.com/watch?v=IdZ12hFw_Ho SPECIAL THANKS to all our wonderful Patreon supporters! Elizabeth Cody David A. Scott, Jr. Timothy Sheridan Ricky Temple If you…

Gomer Plays The Guardian Legend (Part 2: Aquatic Advancing)

After making headway into the planet, Gomer takes out the remaining aquatic corridors in one video! Ending slate music: “Glitchy G Funk Summer” by teknoaxe – https://www.youtube.com/watch?v=IdZ12hFw_Ho SPECIAL THANKS to all our wonderful Patreon supporters! Elizabeth Cody David A. Scott, Jr. Timothy Sheridan Ricky Temple If you want…

error: undefined reference to 'clock_gettime'

Recently I am writing a LLVM plugin which requires some third party library (libxx.a, only static complied Makefile provided).  The plugin is a .so file that can be dynamic linked to the LLVM command executable. When loading the third-party library into the plugin, the loader (ld) seems not doing its job properly. I've got some unresolved symbol error.

At first, I turn the libxx.a into a shared library file (libxx.so).

Add -fPIC option to CXXFLAGS in the Makefile.common;

make;   (generated the libxx.a;)

ar -x libxx.a;   (get a bunch of xxx.o files)

g++ -shared *o -o libxx.so

But this time generated some other unresolved symbols.

After reading the ld manual, I've found some interesting options. The --whole-archive option that force linking a library really works for my case.

g++ -Wl --whole-archive -L/lib_path/ lxx --no-whole-archive other-option

Below are the options I selected from the ld manual. Remember add the -Wl when using the gcc/g++.

If the linker is being invoked indirectly, via a compiler driver (e.g. gcc) then all the linker command line options should be prefixed by -Wl.

--whole-archive            For each archive mentioned on the command line after the --whole-archive option, include every object file in the archive in the link, rather than searching the archive for the required object files.  This is normally used to turn an archive file into a shared library, forcing every object to be included in the resulting shared library.  This option may be used more than once.            Two notes when using this option from gcc: First, gcc doesn't know about this option, so you have to use -Wl, -whole-archive.  Second, don't forget to use -Wl, -no-whole-archive after your list of archives, because gcc will add its own list of archives to your link and you may not want this flag to affect those as well.

--wrap=symbol            Use a wrapper function for symbol.  Any undefined reference to symbol will be resolved to "__wrap_symbol".  Any undefined reference to "__real_symbol" will be resolved to symbol.            This can be used to provide a wrapper for a system function.  The wrapper function should be called "__wrap_symbol".  If it wishes to call the system function, it should call "__real_symbol".            Here is a trivial example:                    void *                    __wrap_malloc (size_t c)                    {                      printf ("malloc called with %zu\n", c);                      return __real_malloc (c);                    }           If you link other code with this file using --wrap malloc, then all calls to "malloc" will call the function  "__wrap_malloc" instead.  The call to "__real_malloc" in "__wrap_malloc" will call the real "malloc" function.

           You may wish to provide a "__real_malloc" function as well, so that links without the --wrap option will succeed.  If you do this, you should not put the definition of "__real_malloc" in the same file as "__wrap_malloc"; if you do, the assembler may resolve the call before the linker has a chance to wrap it to "malloc".