Add default KmpFsMimeTypes

src/androidMain/kotlin/com/outsidesource/oskitkmp/filesystem/KmpFsMimeTypes.android.kt

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+package com.outsidesource.oskitkmp.filesystem
+
+internal actual fun platformMimeTypeHelper(): IMimeTypeHelper = SharedMimeTypeHelper

src/commonMain/kotlin/com/outsidesource/oskitkmp/filesystem/KmpFsMimeTypes.kt

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+package com.outsidesource.oskitkmp.filesystem
+
+interface IMimeTypeHelper {
+    fun getMimeType(extension: String): String?
+    fun getMimeTypes(extensions: List<String>): List<String>
+    val imageMimeTypes: List<KmpFileMimetype>
+    val textMimeTypes: List<KmpFileMimetype>
+}
+
+object KmpFsMimeTypes : IMimeTypeHelper by platformMimeTypeHelper()
+
+internal expect fun platformMimeTypeHelper(): IMimeTypeHelper
+
+internal object SharedMimeTypeHelper : IMimeTypeHelper {
+    private val extensionToMimeType = mapOf(
+        "png" to "image/png",
+        "jpg" to "image/jpeg",
+        "jpeg" to "image/jpeg",
+        "svg" to "image/svg+xml",
+        "bmp" to "image/bmp",
+        "gif" to "image/gif",
+        "webp" to "image/webp",
+        "js" to "application/javascript",
+        "html" to "text/html",
+        "xml" to "application/xml",
+        "txt" to "text/plain"
+    )
+
+    override fun getMimeType(extension: String): String? =
+        extensionToMimeType[extension.lowercase()]
+
+    override fun getMimeTypes(extensions: List<String>): List<String> =
+        extensions.mapNotNull { getMimeType(it) }.distinct()
+
+    override val imageMimeTypes: List<KmpFileMimetype> by lazy {
+        listOf("png", "jpg", "jpeg", "svg", "bmp", "gif", "webp").mapNotNull {
+            getMimeType(it)?.let { mime -> KmpFileMimetype(it, mime) }
+        }
+    }
+
+    override val textMimeTypes: List<KmpFileMimetype> by lazy {
+        listOf("txt", "html", "xml", "js").mapNotNull {
+            getMimeType(it)?.let { mime -> KmpFileMimetype(it, mime) }
+        }
+    }
+}

src/iosMain/kotlin/com/outsidesource/oskitkmp/filesystem/KmpFsMimeTypes.ios.kt

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+package com.outsidesource.oskitkmp.filesystem
+
+internal actual fun platformMimeTypeHelper(): IMimeTypeHelper = SharedMimeTypeHelper

src/jvmMain/kotlin/com/outsidesource/oskitkmp/filesystem/KmpFsMimeTypes.jvm.kt

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+package com.outsidesource.oskitkmp.filesystem
+
+internal actual fun platformMimeTypeHelper(): IMimeTypeHelper = SharedMimeTypeHelper

src/wasmJsMain/kotlin/com/outsidesource/oskitkmp/filesystem/KmpFsMimeTypes.wasm.kt

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+package com.outsidesource.oskitkmp.filesystem
+
+internal actual fun platformMimeTypeHelper(): IMimeTypeHelper = SharedMimeTypeHelper