emscripten-forge · martinRenou · Aug 21, 2026 · Aug 21, 2026 · Aug 21, 2026 · Aug 21, 2026
diff --git a/packages/mambajs-core/schema/lock.v1.0.4.json b/packages/mambajs-core/schema/lock.v1.0.4.json
@@ -0,0 +1,168 @@
+{
+  "title": "ILockV104",
+  "type": "object",
+  "additionalProperties": false,
+  "required": ["lockVersion", "platform", "specs", "channels", "channelInfo", "packages", "pipPackages"],
+  "properties": {
+    "id": {
+      "type": "string"
+    },
+    "lockVersion": {
+      "type": "string",
+      "enum": ["1.0.4"]
+    },
+    "platform": {
+      "type": "string",
+      "enum": [
+        "noarch",
+        "unknown",
+        "linux-32",
+        "linux-64",
+        "linux-aarch64",
+        "linux-armv6l",
+        "linux-armv7l",
+        "linux-loongarch64",
+        "linux-ppc64le",
+        "linux-ppc64",
+        "linux-ppc",
+        "linux-s390x",
+        "linux-riscv32",
+        "linux-riscv64",
+        "freebsd-32",
+        "freebsd-64",
+        "freebsd-arm64",
+        "osx-64",
+        "osx-arm64",
+        "win-32",
+        "win-64",
+        "win-arm64",
+        "emscripten-wasm32",
+        "emscripten-wasm64",
+        "wasi-wasm32",
+        "zos-z"
+      ]
+    },
+    "specs": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      }
+    },
+    "channels": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      }
+    },
+    "channelInfo": {
+      "type": "object",
+      "patternProperties": {
+        "^[a-zA-Z0-9._-]+$": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "required": ["url", "protocol"],
+            "properties": {
+              "url": {
+                "type": "string",
+                "format": "uri"
+              },
+              "protocol": {
+                "type": "string",
+                "enum": ["https"]
+              }
+            },
+            "additionalProperties": false
+          }
+        }
+      },
+      "additionalProperties": false
+    },
+    "packages": {
+      "type": "object",
+      "patternProperties": {
+        ".*": {
+          "type": "object",
+          "required": ["name", "version", "channel"],
+          "properties": {
+            "name": {
+              "type": "string"
+            },
+            "build": {
+              "type": "string"
+            },
+            "version": {
+              "type": "string"
+            },
+            "subdir": {
+              "type": "string"
+            },
+            "channel": {
+              "type": "string"
+            },
+            "size": {
+              "type": "number"
+            },
+            "hash": {
+              "type": "object",
+              "required": [],
+              "properties": {
+                "md5": {
+                  "type": "string"
+                },
+                "sha256": {
+                  "type": "string"
+                }
+              },
+              "additionalProperties": false
+            }
+          },
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    "pipPackages": {
+      "type": "object",
+      "patternProperties": {
+        ".*": {
+          "type": "object",
+          "required": ["name", "version", "url", "registry"],
+          "properties": {
+            "name": {
+              "type": "string"
+            },
+            "version": {
+              "type": "string"
+            },
+            "url": {
+              "type": "string",
+              "format": "uri"
+            },
+            "size": {
+              "type": "number"
+            },
+            "registry": {
+              "type": "string"
+            },
+            "hash": {
+              "type": "object",
+              "required": [],
+              "properties": {
+                "md5": {
+                  "type": "string"
+                },
+                "sha256": {
+                  "type": "string"
+                }
+              },
+              "additionalProperties": false
+            }
+          },
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    }
+  }
+}
diff --git a/packages/mambajs-core/src/helper.ts b/packages/mambajs-core/src/helper.ts
@@ -532,13 +532,16 @@ export function formatChannels(
     }
 
     if (channel === 'emscripten-forge') {
-      logger.warn('emscripten-forge channel alias is deprecated. Please use https://prefix.dev/emscripten-forge-3x explicitely.')
+      logger.warn(
+        'emscripten-forge channel alias is deprecated. Please use https://prefix.dev/emscripten-forge-3x explicitely.'
+      );
       channel = 'https://prefix.dev/emscripten-forge-3x';
     }
 
     if (channel === 'https://prefix.dev/emscripten-forge') {
-      const error = 'https://prefix.dev/emscripten-forge channel does not exist. Please use https://prefix.dev/emscripten-forge-3x or https://prefix.dev/emscripten-forge-4x explicitely.';
-      logger.error(error)
+      const error =
+        'https://prefix.dev/emscripten-forge channel does not exist. Please use https://prefix.dev/emscripten-forge-3x or https://prefix.dev/emscripten-forge-4x explicitely.';
+      logger.error(error);
       throw new Error(error);
     }
 
@@ -586,7 +589,7 @@ export function computePackageChannel(
   }
 
   throw new Error(
-    `Failed to detect channel from ${pkg} (${pkg.channel}), with known channels ${formattedChannels.channels}`
+    `Failed to detect channel from ${pkg.name} (${pkg.channel}), with known channels ${formattedChannels.channels}`
   );
 }
 

diff --git a/packages/mambajs-core/src/index.ts b/packages/mambajs-core/src/index.ts
@@ -33,7 +33,7 @@ export * from './types';
 export * from './helper';
 export * from './parser';
 
-export const MAMBAJS_LOCK_VERSION = '1.0.3';
+export const MAMBAJS_LOCK_VERSION = '1.0.4';
 
 /**
  * Given a lock file, get the Python version

diff --git a/packages/mambajs-core/src/types.ts b/packages/mambajs-core/src/types.ts
@@ -4,7 +4,8 @@ import { ILock } from './types';
 export type { ILockV1 } from './_interface/lock.v1.0.0';
 export type { ILockV101 } from './_interface/lock.v1.0.1';
 export type { ILockV102 } from './_interface/lock.v1.0.2';
-export type { ILockV103 as ILock } from './_interface/lock.v1.0.3';
+export type { ILockV103 } from './_interface/lock.v1.0.3';
+export type { ILockV104 as ILock } from './_interface/lock.v1.0.4';
 
 export interface ILogger {
   log(...msg: any[]): void;

diff --git a/packages/mambajs/package.json b/packages/mambajs/package.json
@@ -37,7 +37,7 @@
     "typescript": "^5"
   },
   "dependencies": {
-    "@conda-org/rattler": "^0.3.5",
+    "@conda-org/rattler": "^0.4.0",
     "@emscripten-forge/mambajs-core": "^0.21.5",
     "yaml": "^2.7.0"
   }

diff --git a/packages/mambajs/src/solver.ts b/packages/mambajs/src/solver.ts
@@ -9,7 +9,12 @@ import {
   MAMBAJS_LOCK_VERSION,
   parseEnvYml
 } from '@emscripten-forge/mambajs-core';
-import { Platform, simpleSolve, SolvedPackage } from '@conda-org/rattler';
+import {
+  isRattlerError,
+  Platform,
+  simpleSolve,
+  SolvedPackage
+} from '@conda-org/rattler';
 
 export interface ISolveOptions {
   ymlOrSpecs?: string | string[];
@@ -29,7 +34,7 @@ const VIRTUAL_PACKAGES = {
   __archspec: makeVirtualPackage('__archspec')
 };
 
-function makeVirtualPackage(name: string, version='0') {
+function makeVirtualPackage(name: string, version = '0') {
   return {
     filename: name,
     packageName: name,
@@ -173,7 +178,10 @@ export const solveConda = async (options: ISolveOptions): Promise<ILock> => {
     });
   } catch (error) {
     let message: string = 'Unknown error';
-    if (typeof error === 'string') {
+
+    if (isRattlerError(error)) {
+      message = `${error.name} ${error.code}: ${error.message}`;
+    } else if (typeof error === 'string') {
       message = error;
     } else if (error instanceof Error) {
       message = error.message;
@@ -196,11 +204,17 @@ export const solveConda = async (options: ISolveOptions): Promise<ILock> => {
   Object.keys(condaPackages).forEach(filename => {
     const pkg = condaPackages[filename];
 
+    // Remove virtual package from the result
+    if (pkg.name in VIRTUAL_PACKAGES) {
+      delete condaPackages[filename];
+      return;
+    }
+
     const channel = computePackageChannel(pkg, formattedChannels);
 
     if (!channel) {
       throw new Error(
-        `Failed to detect channel from ${pkg} (${pkg.channel}), with known channels ${formattedChannels.channels}`
+        `Failed to detect channel from ${pkg.name} (${pkg.channel}), with known channels ${formattedChannels.channels}`
       );
     }
 

diff --git a/yarn.lock b/yarn.lock
@@ -34,10 +34,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@conda-org/rattler@npm:^0.3.5":
-  version: 0.3.5
-  resolution: "@conda-org/rattler@npm:0.3.5"
-  checksum: 3f18697c380cf13f91a27bcd2c64eb7ccd3113f7ab104d8f5bc2d5be0ab217e7cf161217de601fd477014629e96c445eadd354d6f5473c117e6d68f8a41440cb
+"@conda-org/rattler@npm:^0.4.0":
+  version: 0.4.0
+  resolution: "@conda-org/rattler@npm:0.4.0"
+  checksum: 8ff26333dbba11175e620aea95ae5c9246d1b2b38034fa3957f8065160f95dc0df645e8ec692d0b649f53d9e96d9322229a489e80a750c1df64a934025822187
   languageName: node
   linkType: hard
 
@@ -128,7 +128,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@emscripten-forge/mambajs@workspace:packages/mambajs"
   dependencies:
-    "@conda-org/rattler": ^0.3.5
+    "@conda-org/rattler": ^0.4.0
     "@emscripten-forge/mambajs-core": ^0.21.5
     "@esbuild-plugins/node-globals-polyfill": ^0.2.3
     "@esbuild-plugins/node-modules-polyfill": ^0.2.2