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The jc tool includes a code minifier (adapted from uglify) providing a high compression ratio. Alternatively (built-in minifier is slow), an external minifier
jsmin can be used. The C source is provided in the
In contrast to uglify or any other compiler, jc creates a bundled project code file by using a main (top-level) file passed as the only file to the make tool. Jc creates a bundled program or library by executing the code performing a live build! Each imported module is recorded and the file content is finally embedded in the bundled output file.
Commonly modules are imported by using the
require function. Files to be embedded in the bundled file using jc must be imported by using special functions (
Import) provided by the compiler. The module files are searched using the current working directory path, a specified top level path, or additional include paths. Include paths can be relative to the current working directory. The final code can still use
require calls but the files are not embedded.
Since there is no code analysis the program to be created must import all modules that should be embedded using
Require on module top-level. In the case there are conditional or deeper code imports (inside functions, e.g.,
if (cond) m=require("m")) a pre-loading (only executed at build time) can be performed by using
RequireIf. Command line arguments can be passed to the project code (e.g.,
-- --version) to ensure proper execution of the project code.
-lib option is set, a bundled library is created (passing the module exports of the main file to the library file). Otherwise, a standalone JS executable file is created that can be directly executed from command line (assuming
node is installed on the system).
Project build options can be provided by command line arguments or by providing one single JSON make file.
Although there is no traditional source code compiling the source code must be valid JS syntax. Basically ECMAScript 5 is supported, but this depends on the JS VM used to execute jc and the final program. Note that the built-in minifier performs syntax checking and only supports ECMAScript 5 (and versions below).