{

"version": {

"category": "General",

"description": "Prints just the compiler's version and exits.",

"type": "b",

"alias": "v"

},

"help": {

"category": "General",

"description": "Prints this message and exits.",

"type": "b",

"alias": "h"

},

"noColors": {

"category": "General",

"description": "Disables terminal colors.",

"type": "b",

"default": false

},

"config": {

"category": "General",

"description": "Configuration file to apply. CLI arguments take precedence.",

"type": "s",

"cliOnly": true

},

"target": {

"category": "General",

"description": "Target configuration to use. Defaults to 'release'.",

"type": "s",

"cliOnly": true

},

"optimize": {

"category": "Optimization",

"description": [

"Optimizes the module. Typical shorthands are:",

"",

" Default optimizations -O / -O3s",

" Make a release build -O --noAssert",

" Make a debug build --debug",

" Optimize for speed -O3",

" Optimize for size -O3z --converge",

""

],

"type": "b",

"alias": "O"

},

"optimizeLevel": {

"category": "Optimization",

"description": "How much to focus on optimizing code. [0-3]",

"type": "i"

},

"shrinkLevel": {

"category": "Optimization",

"description": "How much to focus on shrinking code size. [0-2, s=1, z=2]",

"type": "i"

},

"converge": {

"category": "Optimization",

"description": "Re-optimizes until no further improvements can be made.",

"type": "b",

"default": false

},

"noAssert": {

"category": "Optimization",

"description": "Replaces assertions with just their value without trapping.",

"type": "b",

"default": false

},

"runtime": {

"category": "Optimization",

"description": [

"Specifies the runtime variant to include in the program.",

"",

" full Default runtime based on TLSF and reference counting.",

" half Same as 'full', but not exported to the host.",

" stub Minimal stub implementation without free/GC support.",

" none Same as 'stub', but not exported to the host.",

""

],

"type": "s",

"default": "full"

},

"outFile": {

"category": "Output",

"description": "Specifies the output file. File extension indicates format.",

"type": "s",

"alias": "o"

},

"binaryFile": {

"category": "Output",

"description": "Specifies the binary output file (.wasm).",

"type": "s",

"alias": "b"

},

"textFile": {

"category": "Output",

"description": "Specifies the text output file (.wat).",

"type": "s",

"alias": "t"

},

"jsFile": {

"category": "Output",

"description": "Specifies the JavaScript (via wasm2js) output file (.js).",

"type": "s",

"alias": "j"

},

"idlFile": {

"category": "Output",

"description": "Specifies the WebIDL output file (.webidl).",

"type": "s",

"alias": "i"

},

"tsdFile": {

"category": "Output",

"description": "Specifies the TypeScript definition output file (.d.ts).",

"type": "s",

"alias": "d"

},

"sourceMap": {

"category": "Debugging",

"description": [

"Enables source map generation. Optionally takes the URL",

"used to reference the source map from the binary file."

],

"type": "s"

},

"debug": {

"category": "Debugging",

"description": "Enables debug information in emitted binaries.",

"type": "b",

"default": false

},

"importMemory": {

"category": "Features",

"description": "Imports the memory provided as 'env.memory'.",

"type": "b",

"default": false

},

"noExportMemory": {

"category": "Features",

"description": "Does not export the memory as 'memory'.",

"type": "b",

"default": false

},

"initialMemory": {

"category": "Features",

"description": "Sets the initial memory size in pages.",

"type": "i",

"default": 0

},

"maximumMemory": {

"category": "Features",

"description": "Sets the maximum memory size in pages.",

"type": "i",

"default": 0

},

"sharedMemory": {

"category": "Features",

"description": "Declare memory as shared. Requires maximumMemory.",

"type": "b",

"default": false

},

"importTable": {

"category": "Features",

"description": "Imports the function table provided as 'env.table'.",

"type": "b",

"default": false

},

"exportTable": {

"category": "Features",

"description": "Exports the function table as 'table'.",

"type": "b",

"default": false

},

"explicitStart": {

"category": "Features",

"description": "Exports an explicit '_start' function to call.",

"type": "b",

"default": false

},

"enable": {

"category": "Features",

"description": [

"Enables WebAssembly features being disabled by default.",

"",

" sign-extension Sign-extension operations",

" bulk-memory Bulk memory operations.",

" simd SIMD types and operations.",

" threads Threading and atomic operations.",

" reference-types Reference types and operations.",

""

],

"TODO_doesNothingYet": [

" nontrapping-f2i Non-trapping float to integer ops.",

" exception-handling Exception handling.",

" tail-calls Tail call operations.",

" multi-value Multi value types."

],

"type": "S",

"mutuallyExclusive": "disable"

},

"disable": {

"category": "Features",

"description": [

"Disables WebAssembly features being enabled by default.",

"",

" mutable-globals Mutable global imports and exports.",

""

],

"type": "S",

"mutuallyExclusive": "enable"

},

"use": {

"category": "Features",

"description": [

"Aliases a global object under another name, e.g., to switch",

"the default 'Math' implementation used: --use Math=JSMath",

"Can also be used to introduce an integer constant."

],

"type": "S",

"alias": "u"

},

"lowMemoryLimit": {

"category": "Features",

"description": "Enforces very low (<64k) memory constraints.",

"default": 0,

"type": "i"

},

"memoryBase": {

"category": "Linking",

"description": "Sets the start offset of emitted memory segments.",

"type": "i",

"default": 0

},

"tableBase": {

"category": "Linking",

"description": "Sets the start offset of emitted table elements.",

"type": "i",

"default": 0

},

"transform": {

"category": "API",

"description": "Specifies the path to a custom transform to 'require'.",

"type": "S",

"isPath": true,

"useNodeResolution": true

},

"trapMode": {

"category": "Binaryen",

"description": [

"Sets the trap mode to use.",

"",

" allow Allow trapping operations. This is the default.",

" clamp Replace trapping operations with clamping semantics.",

" js Replace trapping operations with JS semantics.",

""

],

"type": "s",

"default": "allow"

},

"runPasses": {

"category": "Binaryen",

"description": [

"Specifies additional Binaryen passes to run after other",

"optimizations, if any. See: Binaryen/src/passes/pass.cpp"

],

"type": "s"

},

"noValidate": {

"category": "Binaryen",

"description": "Skips validating the module using Binaryen.",

"type": "b",

"default": false

},

"baseDir": {

"description": "Specifies the base directory of input and output files.",

"type": "s",

"default": "."

},

"extension": {

"description": "Specifies an alternative file extension to use.",

"type": "s",

"cliOnly": true

},

"noUnsafe": {

"description": [

"Disallows the use of unsafe features in user code.",

"Does not affect library files and external modules."

],

"type": "b",

"default": false

},

"noEmit": {

"description": "Performs compilation as usual but does not emit code.",

"type": "b",

"default": false

},

"showConfig": {

"description": "Print computed compiler options and exit.",

"type": "b",

"default": false

},

"measure": {

"description": "Prints measuring information on I/O and compile times.",

"type": "b",

"default": false

},

"pedantic": {

"description": "Make yourself sad for no good reason.",

"type": "b",

"default": false

},

"lib": {

"description": [

"Adds one or multiple paths to custom library components and",

"uses exports of all top-level files at this path as globals."

],

"type": "S",

"isPath": true

},

"path": {

"description": [

"Adds one or multiple paths to package resolution, similar",

"to node_modules. Prefers an 'ascMain' entry in a package's",

"package.json and falls back to an inner 'assembly/' folder."

],

"type": "S",

"isPath": true

},

"traceResolution": {

"description": "Enables tracing of package resolution.",

"type": "b",

"default": false

},

"listFiles": {

"description": "Lists files to be compiled and exits.",

"type": "b",

"default": false

},

" ...": {

"description": "Specifies node.js options (CLI only). See: node --help"

},

"-Os": { "value": { "optimize": true, "shrinkLevel": 1 } },

"-Oz": { "value": { "optimize": true, "shrinkLevel": 2 } },

"-O0": { "value": { "optimizeLevel": 0, "shrinkLevel": 0 } },

"-O1": { "value": { "optimizeLevel": 1, "shrinkLevel": 0 } },

"-O2": { "value": { "optimizeLevel": 2, "shrinkLevel": 0 } },

"-O3": { "value": { "optimizeLevel": 3, "shrinkLevel": 0 } },

"-O0s": { "value": { "optimizeLevel": 0, "shrinkLevel": 1 } },

"-O1s": { "value": { "optimizeLevel": 1, "shrinkLevel": 1 } },

"-O2s": { "value": { "optimizeLevel": 2, "shrinkLevel": 1 } },

"-O3s": { "value": { "optimizeLevel": 3, "shrinkLevel": 1 } },

"-O0z": { "value": { "optimizeLevel": 0, "shrinkLevel": 2 } },

"-O1z": { "value": { "optimizeLevel": 1, "shrinkLevel": 2 } },

"-O2z": { "value": { "optimizeLevel": 2, "shrinkLevel": 2 } },

"-O3z": { "value": { "optimizeLevel": 3, "shrinkLevel": 2 } }

}