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{
"version": {
"description": "Prints just the compiler's version and exits.",
"type": "b",
"alias": "v"
},
"help": {
"description": "Prints this message and exits.",
"type": "b",
"alias": "h"
},
"optimize": {
"description": [
"Optimizes the module. Also has the usual shorthands:",
"",
" -O Uses defaults. Equivalent to -O2s",
" -O0 Equivalent to --optimizeLevel 0",
" -O1 Equivalent to --optimizeLevel 1",
" -O2 Equivalent to --optimizeLevel 2",
" -O3 Equivalent to --optimizeLevel 3",
" -Oz Equivalent to -O but with --shrinkLevel 2",
" -O3s Equivalent to -O3 with --shrinkLevel 1 etc.",
""
],
"type": "b",
"alias": "O"
},
"optimizeLevel": {
"description": "How much to focus on optimizing code. [0-3]",
"type": "i"
},
"shrinkLevel": {
"description": "How much to focus on shrinking code size. [0-2, s=1, z=2]",
"type": "i"
},
"validate": {
"description": "Validates the module using Binaryen. Exits if invalid.",
"type": "b",
"alias": "c",
"default": false
},
"baseDir": {
"description": "Specifies the base directory of input and output files.",
"type": "s",
"default": "."
},
"outFile": {
"description": "Specifies the output file. File extension indicates format.",
"type": "s",
"alias": "o"
},
"binaryFile": {
"description": "Specifies the binary output file (.wasm).",
"type": "s",
"alias": "b"
},
"textFile": {
"description": "Specifies the text output file (.wat).",
"type": "s",
"alias": "t"
},
"asmjsFile": {
"description": "Specifies the asm.js output file (.js).",
"type": "s",
"alias": "a"
},
"idlFile": {
"description": "Specifies the WebIDL output file (.webidl).",
"type": "s",
"alias": "i"
},
"tsdFile": {
"description": "Specifies the TypeScript definition output file (.d.ts).",
"type": "s",
"alias": "d"
},
"sourceMap": {
"description": [
"Enables source map generation. Optionally takes the URL",
"used to reference the source map from the binary file."
],
"type": "s"
},
"debug": {
"description": "Enables debug information in emitted binaries.",
"type": "b",
"default": false
},
"noAssert": {
"description": "Replaces assertions with just their value without trapping.",
"type": "b",
"default": false
},
"noEmit": {
"description": "Performs compilation as usual but does not emit code.",
"type": "b",
"default": false
},
"importMemory": {
"description": "Imports the memory instance provided by the embedder.",
"type": "b",
"default": false
},
"sharedMemory": {
"description": "Declare memory as shared by settings the max shared memory.",
"type": "i",
"default": 0
},
"memoryBase": {
"description": "Sets the start offset of compiler-generated static memory.",
"type": "i",
"default": 0
},
"importTable": {
"description": "Imports the function table instance provided by the embedder.",
"type": "b",
"default": false
},
"noLib": {
"description": "Does not include the shipped standard library.",
"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"
},
"use": {
"description": [
"Aliases a global object under another name, e.g., to switch",
"the default 'Math' implementation used: --use Math=JSMath"
],
"type": "S",
"alias": "u"
},
"trapMode": {
"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": {
"description": [
"Specifies additional Binaryen passes to run after other",
"optimizations, if any. See: Binaryen/src/passes/pass.cpp"
],
"type": "s"
},
"enable": {
"description": [
"Enables additional (experimental) WebAssembly features.",
"",
" sign-extension Enables sign-extension operations",
" mutable-global Enables mutable global imports and exports",
" bulk-memory Enables bulk memory operations",
" simd Enables SIMD types and operations.",
" threads Enables threading and atomic operations.",
""
],
"type": "s"
},
"transform": {
"description": "Specifies the path to a custom transform to 'require'.",
"type": "S"
},
"measure": {
"description": "Prints measuring information on I/O and compile times.",
"type": "b",
"default": false
},
"noColors": {
"description": "Disables terminal colors.",
"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 } }
}