Usage: kotlinc-js <options> <source files>
where advanced options include:
  -Xcache-directory=<path>   Path to the cache directory.
  -Xenable-js-scripting      Enable experimental support for .kts files using K/JS (with '-Xir' only).
  -Xerror-tolerance-policy   Set up an error tolerance policy (NONE, SEMANTIC, SYNTAX, ALL).
  -Xenable-extension-functions-in-externals
                             Enable extension function members in external interfaces.
  -Xfake-override-validator  Enable the IR fake override validator.
  -Xfriend-modules=<path>    Paths to friend modules.
  -Xfriend-modules-disabled  Disable internal declaration export.
  -Xgenerate-dts             Generate a TypeScript declaration .d.ts file alongside the JS file. This is available only in the IR backend.
  -Xgenerate-polyfills       Generate polyfills for features from the ES6+ standards.
  -Xinclude=<path>           Path to an intermediate library that should be processed in the same manner as source files.
  -Xir-base-class-in-metadata Write base classes into metadata.
  -Xir-build-cache           Use the compiler to build the cache.
  -Xir-dce                   Perform experimental dead code elimination.
  -Xir-dump-declaration-ir-sizes-to-file=<path>
                             Dump the IR size of each declaration into a file. The format will be chosen automatically depending on the file extension. Supported output formats include JSON for .json, a JS const initialized with a plain object containing information for .js, and plain text for all other file types.
  -Xir-dce-dump-reachability-info-to-file=<path>
                             Dump reachability information collected about declarations while performing DCE to a file. The format will be chosen automatically based on the file extension. Supported output formats include JSON for .json, a JS const initialized with a plain object containing information for .js, and plain text for all other file types.
  -Xir-dce-print-reachability-info
                             Print reachability information about declarations to 'stdout' while performing DCE.
  -Xir-dce-runtime-diagnostic={log|exception}
                             Enable runtime diagnostics instead of removing declarations when performing DCE.
  -Xir-generate-inline-anonymous-functions
                             Lambda expressions that capture values are translated into in-line anonymous JavaScript functions.
  -Xir-keep                  Comma-separated list of fully qualified names not to be eliminated by DCE (if it can be reached), and for which to keep non-minified names.
  -Xir-minimized-member-names Minimize the names of members.
  -Xir-module-name=<name>    Specify the name of the compilation module for the IR backend.
  -Xir-new-ir2js             New fragment-based 'ir2js'.
  -Xir-only                  Disable the pre-IR backend.
  -Xir-per-file              Generate one .js file per source file.
  -Xir-per-module            Generate one .js file per module.
  -Xir-per-module-output-name Add a custom output name to the split .js files.
  -Xir-produce-js            Generate a JS file using the IR backend. This option also disables the pre-IR backend.
  -Xir-produce-klib-dir      Generate an unpacked klib into the parent directory of the output JS file.
                             In combination with '-meta-info', this generates both IR and pre-IR versions of the library.
  -Xir-produce-klib-file     Generate a packed klib into the file specified by '-output'. This disables the pre-IR backend.
  -Xir-property-lazy-initialization
                             Perform lazy initialization for properties.
  -Xir-safe-external-boolean Wrap access to external 'Boolean' properties with an explicit conversion to 'Boolean'.
  -Xir-safe-external-boolean-diagnostic={log|exception}
                             Enable runtime diagnostics when accessing external 'Boolean' properties.
  -Xoptimize-generated-js    Perform additional optimizations on the generated JS code.
  -Xpartial-linkage-loglevel={info|warning|error}
                             Define the compile-time log level for partial linkage.
  -Xpartial-linkage={enable|disable}
                             Use partial linkage mode.
  -Xplatform-arguments-in-main-function
                             JS expression that will be executed in runtime and be put as an Array<String> parameter of the main function
  -Xstrict-implicit-export-types Generate strict types for implicitly exported entities inside d.ts files. This is available in the IR backend only.
  -Xtyped-arrays             Translate primitive arrays into JS typed arrays.
  -Xes-classes               Let generated JavaScript code use ES2015 classes.
  -Xes-generators            Enable ES2015 generator functions usage inside the compiled code
  -Xwasm                     Use the experimental WebAssembly compiler backend.
  -Xwasm-debug-info          Add debug info to the compiled WebAssembly module.
  -Xwasm-enable-array-range-checks
                             Turn on range checks for array access functions.
  -Xwasm-enable-asserts      Turn on asserts.
  -Xwasm-generate-wat        Generate a .wat file.
  -Xwasm-kclass-fqn          Enable support for 'KClass.qualifiedName'.
  -Xwasm-target              Set up the Wasm target (wasm-js or wasm-wasi).
  -Xwasm-use-traps-instead-of-exceptions
                             Use traps instead of throwing exceptions.
  -Xallow-any-scripts-in-source-roots
                             Allow compiling scripts along with regular Kotlin sources.
  -Xallow-kotlin-package     Allow compiling code in the 'kotlin' package, and allow not requiring 'kotlin.stdlib' in 'module-info'.
  -Xcheck-phase-conditions   Check pre- and postconditions of IR lowering phases.
  -Xcheck-sticky-phase-conditions
                             Run sticky condition checks on subsequent phases. Implicitly enables '-Xcheck-phase-conditions'.
  -Xcommon-sources=<path>    Sources of the common module that need to be compiled together with this module in multiplatform mode.
                             They should be a subset of sources passed as free arguments.
  -Xcontext-receivers        Enable experimental context receivers.
  -Xdisable-default-scripting-plugin
                             Don't enable the scripting plugin by default.
  -Xdisable-phases           Disable backend phases.
  -Xdont-warn-on-error-suppression
                             Don't report warnings when errors are suppressed. This only affects K2.
  -Xdump-directory           Dump the backend state into this directory.
  -Xdump-fqname              Dump the declaration with the given FqName.
  -Xdump-perf=<path>         Dump detailed performance statistics to the specified file.
  -Xenable-builder-inference Use builder inference by default for all calls with lambdas that can't be resolved without it.
                             The corresponding calls' declarations may not be marked with @BuilderInference.
  -Xklib-enable-signature-clash-checks
                             Enable signature uniqueness checks.
  -Xexpect-actual-classes    'expect'/'actual' classes (including interfaces, objects, annotations, enums, and 'actual' typealiases) are in Beta.
                             Kotlin reports a warning every time you use one of them. You can use this flag to mute the warning.
  -Xexplicit-api={strict|warning|disable}
                             Force the compiler to report errors on all public API declarations without an explicit visibility or a return type.
                             Use the 'warning' level to issue warnings instead of errors.
  -Xextended-compiler-checks Enable additional compiler checks that might provide verbose diagnostic information for certain errors.
                             Warning: This mode is not backward compatible and might cause compilation errors in previously compiled code.
  -Xfragment-refines=<fromModuleName>:<onModuleName>
                             Declare that <fromModuleName> refines <onModuleName> with the dependsOn/refines relation.
  -Xfragment-sources=<fragment name>:<path>
                             Add sources to a specific fragment of a multiplatform compilation.
  -Xfragments=<fragment name> Declare all known fragments of a multiplatform compilation.
  -Xignore-const-optimization-errors
                             Ignore all compilation exceptions while optimizing some constant expressions.
  -Xenable-incremental-compilation
                             Enable incremental compilation.
  -Xinference-compatibility  Enable compatibility changes for the generic type inference algorithm.
  -Xinline-classes           Enable experimental inline classes.
  -Xintellij-plugin-root=<path> Path to 'kotlin-compiler.jar' or the directory where the IntelliJ IDEA configuration files can be found.
  -Xlegacy-smart-cast-after-try Allow 'var' smart casts even in the presence of assignments in 'try' blocks.
  -Xlist-phases              List backend phases.
  -Xmetadata-klib            Produce a klib that only contains the metadata of declarations.
  -Xmetadata-version         Change the metadata version of the generated binary files.
  -Xmulti-platform           Enable language support for multiplatform projects.
  -Xnew-inference            Enable the new experimental generic type inference algorithm.
  -Xno-check-actual          Do not check for the presence of the 'actual' modifier in multiplatform projects.
  -Xno-inline                Disable method inlining.
  -Xklib-normalize-absolute-path Normalize absolute paths in klibs.
  -Xphases-to-dump           Dump the backend's state both before and after these phases.
  -Xphases-to-dump-after     Dump the backend's state after these phases.
  -Xphases-to-dump-before    Dump the backend's state before these phases.
  -Xphases-to-validate       Validate the backend's state both before and after these phases.
  -Xphases-to-validate-after Validate the backend's state after these phases.
  -Xphases-to-validate-before Validate the backend's state before these phases.
  -Xplugin=<path>            Load plugins from the given classpath.
  -Xcompiler-plugin=<path1>,<path2>:<optionName>=<value>,<optionName>=<value>
                             Register a compiler plugin.
  -Xprofile-phases           Profile backend phases.
  -Xklib-relative-path-base  Provide a base path to compute the source's relative paths in klib (default is empty).
  -Xrender-internal-diagnostic-names
                             Render the internal names of warnings and errors.
  -Xreport-output-files      Report the source-to-output file mapping.
  -Xreport-perf              Report detailed performance statistics.
  -Xself-upper-bound-inference Support inferring type arguments from the self-type upper bounds of the corresponding type parameters.
  -Xskip-metadata-version-check Allow loading classes with bad metadata versions and pre-release classes.
  -Xskip-prerelease-check    Allow loading pre-release classes.
  -Xsuppress-api-version-greater-than-language-version-error
                             Suppress error about API version greater than language version.
                             Warning: This is temporary solution (see KT-63712) intended to be used only for stdlib build.
  -Xsuppress-version-warnings Suppress warnings about outdated, inconsistent, or experimental language or API versions.
  -Xunrestricted-builder-inference
                             Eliminate builder inference restrictions, for example by allowing type variables to be returned from builder inference calls.
  -Xuse-fir-extended-checkers Use extended analysis mode based on the frontend IR.
                             Warning: This feature is not yet production-ready.
  -Xuse-fir-ic               Compile using frontend IR internal incremental compilation.
                             Warning: This feature is not yet production-ready.
  -Xuse-fir-lt               Compile using the LightTree parser with the frontend IR.
  -Xuse-ir-fake-override-builder Generate fake overrides via IR. See KT-61514
  -Xuse-k2                   Compile using the experimental K2 compiler pipeline. No compatibility guarantees are provided yet.
  -Xverbose-phases           Be verbose while performing the given backend phases.

Advanced options are non-standard and may be changed or removed without any notice.
OK