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    protobufjs-cli
    TypeScript icon, indicating that this package has built-in type declarations

    1.1.0 • Public • Published

    protobufjs-cli

    npm

    Command line interface (CLI) for protobuf.js.

    This can be used to translate between file formats and to generate static code as well as TypeScript definitions.

    pbjs for JavaScript

    Translates between file formats and generates static code.
    
      -t, --target     Specifies the target format. Also accepts a path to require a custom target.
    
                       json          JSON representation
                       json-module   JSON representation as a module
                       proto2        Protocol Buffers, Version 2
                       proto3        Protocol Buffers, Version 3
                       static        Static code without reflection (non-functional on its own)
                       static-module Static code without reflection as a module
    
      -p, --path       Adds a directory to the include path.
    
      -o, --out        Saves to a file instead of writing to stdout.
    
      --sparse         Exports only those types referenced from a main file (experimental).
    
      Module targets only:
    
      -w, --wrap       Specifies the wrapper to use. Also accepts a path to require a custom wrapper.
    
                       default   Default wrapper supporting both CommonJS and AMD
                       commonjs  CommonJS wrapper
                       amd       AMD wrapper
                       es6       ES6 wrapper (implies --es6)
                       closure   A closure adding to protobuf.roots where protobuf is a global
    
      -r, --root       Specifies an alternative protobuf.roots name.
    
      -l, --lint       Linter configuration. Defaults to protobuf.js-compatible rules:
    
                       eslint-disable block-scoped-var, no-redeclare, no-control-regex, no-prototype-builtins
    
      --es6            Enables ES6 syntax (const/let instead of var)
    
      Proto sources only:
    
      --keep-case      Keeps field casing instead of converting to camel case.
    
      Static targets only:
    
      --no-create      Does not generate create functions used for reflection compatibility.
      --no-encode      Does not generate encode functions.
      --no-decode      Does not generate decode functions.
      --no-verify      Does not generate verify functions.
      --no-convert     Does not generate convert functions like from/toObject
      --no-delimited   Does not generate delimited encode/decode functions.
      --no-beautify    Does not beautify generated code.
      --no-comments    Does not output any JSDoc comments.
      --no-service     Does not output service classes.
    
      --force-long     Enforces the use of 'Long' for s-/u-/int64 and s-/fixed64 fields.
      --force-number   Enforces the use of 'number' for s-/u-/int64 and s-/fixed64 fields.
      --force-message  Enforces the use of message instances instead of plain objects.
    
    usage: pbjs [options] file1.proto file2.json ...  (or pipe)  other | pbjs [options] -
    

    For production environments it is recommended to bundle all your .proto files to a single .json file, which minimizes the number of network requests and avoids any parser overhead (hint: works with just the light library):

    $> pbjs -t json file1.proto file2.proto > bundle.json
    

    Now, either include this file in your final bundle:

    var root = protobuf.Root.fromJSON(require("./bundle.json"));

    or load it the usual way:

    protobuf.load("bundle.json", function(err, root) {
        ...
    });

    Generated static code, on the other hand, works with just the minimal library. For example

    $> pbjs -t static-module -w commonjs -o compiled.js file1.proto file2.proto
    

    will generate static code for definitions within file1.proto and file2.proto to a CommonJS module compiled.js.

    ProTip! Documenting your .proto files with /** ... */-blocks or (trailing) /// ... lines translates to generated static code.

    pbts for TypeScript

    Generates TypeScript definitions from annotated JavaScript files.
    
      -o, --out       Saves to a file instead of writing to stdout.
    
      -g, --global    Name of the global object in browser environments, if any.
    
      --no-comments   Does not output any JSDoc comments.
    
      Internal flags:
    
      -n, --name      Wraps everything in a module of the specified name.
    
      -m, --main      Whether building the main library without any imports.
    
    usage: pbts [options] file1.js file2.js ...  (or)  other | pbts [options] -
    

    Picking up on the example above, the following not only generates static code to a CommonJS module compiled.js but also its respective TypeScript definitions to compiled.d.ts:

    $> pbjs -t static-module -w commonjs -o compiled.js file1.proto file2.proto
    $> pbts -o compiled.d.ts compiled.js
    

    Additionally, TypeScript definitions of static modules are compatible with their reflection-based counterparts (i.e. as exported by JSON modules), as long as the following conditions are met:

    1. Instead of using new SomeMessage(...), always use SomeMessage.create(...) because reflection objects do not provide a constructor.
    2. Types, services and enums must start with an uppercase letter to become available as properties of the reflected types as well (i.e. to be able to use MyMessage.MyEnum instead of root.lookup("MyMessage.MyEnum")).

    For example, the following generates a JSON module bundle.js and a bundle.d.ts, but no static code:

    $> pbjs -t json-module -w commonjs -o bundle.js file1.proto file2.proto
    $> pbjs -t static-module file1.proto file2.proto | pbts -o bundle.d.ts -
    

    Reflection vs. static code

    While using .proto files directly requires the full library respectively pure reflection/JSON the light library, pretty much all code but the relatively short descriptors is shared.

    Static code, on the other hand, requires just the minimal library, but generates additional source code without any reflection features. This also implies that there is a break-even point where statically generated code becomes larger than descriptor-based code once the amount of code generated exceeds the size of the full respectively light library.

    There is no significant difference performance-wise as the code generated statically is pretty much the same as generated at runtime and both are largely interchangeable as seen in the previous section.

    Source Library Advantages Tradeoffs
    .proto full Easily editable
    Interoperability with other libraries
    No compile step
    Some parsing and possibly network overhead
    JSON light Easily editable
    No parsing overhead
    Single bundle (no network overhead)
    protobuf.js specific
    Has a compile step
    static minimal Works where eval access is restricted
    Fully documented
    Small footprint for small protos
    Can be hard to edit
    No reflection
    Has a compile step

    Command line API

    Both utilities can be used programmatically by providing command line arguments and a callback to their respective main functions:

    var pbjs = require("protobufjs-cli/pbjs"); // or require("protobufjs-cli").pbjs / .pbts
    
    pbjs.main([ "--target", "json-module", "path/to/myproto.proto" ], function(err, output) {
        if (err)
            throw err;
        // do something with output
    });

    License: BSD 3-Clause License

    Keywords

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    Install

    npm i protobufjs-cli

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