Add JS target

bip39-lib/build.gradle.kts

@@ -16,8 +16,8 @@ plugins {
     id("signing")
 }
 
-val enableNative = project.property("NATIVE_TARGETS_ENABLED").toString().toBoolean()
-val nativeTargets = if (enableNative) arrayOf(
+val enableNonJvm = project.property("NONJVM_TARGETS_ENABLED").toString().toBoolean()
+val nativeTargets = if (enableNonJvm) arrayOf(
     "linuxX64",
     "macosX64", "macosArm64",
     "iosArm64", "iosX64", "iosSimulatorArm64",
@@ -32,6 +32,12 @@ kotlin {
             useJUnitPlatform()
         }
     }
+    if (enableNonJvm) {
+        js(IR) {
+            browser() // to compile for the web
+            nodejs() // to compile against node
+        }
+    }
     for (target in nativeTargets) {
         targets.add(presets.getByName(target).createTarget(target))
     }
@@ -58,13 +64,16 @@ kotlin {
                 implementation(libs.kotest.runner.junit5)
             }
         }
-        if (enableNative) {
+        if (enableNonJvm) {
             val nonJvmMain by creating {
                 dependsOn(commonMain)
                 dependencies {
                     implementation(libs.com.squareup.okio)
                 }
             }
+            val jsMain by getting {
+                dependsOn(nonJvmMain)
+            }
             val mingwMain by creating {
                 dependsOn(nonJvmMain)
             }

bip39-lib/src/jsMain/kotlin/cash/z/ecc/android/random/SecureRandom.kt

@@ -0,0 +1,30 @@
+package cash.z.ecc.android.random
+
+import kotlinx.browser.window
+import org.w3c.dom.get
+
+actual class SecureRandom {
+
+    var crypto: dynamic = null
+
+    init {
+        crypto = try {
+            // browser
+            window["crypto"]
+        } catch (_: Throwable) {
+            null
+        }
+        if (crypto == null) {
+            try {
+                // node
+                crypto = js("""require("crypto")""").webcrypto
+            } catch (_: Throwable) {
+            }
+        }
+        requireNotNull(crypto) { "Could not get crypto from window or node" }
+    }
+
+    actual fun nextBytes(bytes: ByteArray) {
+        crypto.getRandomValues(bytes)
+    }
+}

bip39-lib/webpack.config.d/resolve.js

@@ -0,0 +1,4 @@
+config.resolve.fallback = {
+    ...config.resolve.fallback,
+    crypto: false,
+};

gradle.properties

@@ -6,7 +6,7 @@ org.gradle.parallel=true
 org.gradle.vfs.watch=true
 
 kotlin.mpp.stability.nowarn=true
-NATIVE_TARGETS_ENABLED=true
+NONJVM_TARGETS_ENABLED=true
 
 BIP39_IS_TREAT_WARNINGS_AS_ERRORS=true
 BIP39_IS_COVERAGE_ENABLED=true