gatsbyjs / gatsby

The best React-based framework with performance, scalability and security built in.
https://www.gatsbyjs.com
MIT License
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RuntimeError: memory access out of bounds - gatsby development extremely slow #15092

Closed vai0 closed 5 years ago

vai0 commented 5 years ago

Description

Developing on Gatsby has been over time significantly slowing down - at times taking up 20-30 seconds for the hot loader to refresh the page. After around 10-20 updates to a page - it eventually always runs into the following error below:

error UNHANDLED REJECTION

  RuntimeError: memory access out of bounds

  - source-map-consumer.js:335 BasicSourceMapConsumer._parseMappings
    [frontend]/[gatsby]/[react-hot-loader]/[source-map]/lib/source-map-consumer.js:335:44

  - source-map-consumer.js:315 BasicSourceMapConsumer._getMappingsPtr
    [frontend]/[gatsby]/[react-hot-loader]/[source-map]/lib/source-map-consumer.js:315:12

  - source-map-consumer.js:387 _wasm.withMappingCallback
    [frontend]/[gatsby]/[react-hot-loader]/[source-map]/lib/source-map-consumer.js:387:57

  - wasm.js:95 Object.withMappingCallback
    [frontend]/[gatsby]/[react-hot-loader]/[source-map]/lib/wasm.js:95:11

  - source-map-consumer.js:371 BasicSourceMapConsumer.eachMapping
    [frontend]/[gatsby]/[react-hot-loader]/[source-map]/lib/source-map-consumer.js:371:16

  - source-node.js:87 Function.fromStringWithSourceMap
    [frontend]/[gatsby]/[react-hot-loader]/[source-map]/lib/source-node.js:87:24

  - webpack.development.js:150 onSourceMapReady
    [frontend]/[gatsby]/[react-hot-loader]/dist/webpack.development.js:150:61

  - next_tick.js:68 process._tickCallback
    internal/process/next_tick.js:68:7

Our site is has roughly 250+ static pages in /pages, and is programmatically building around 30 pages from *.yml files generated by netlify-cms.

I suspect that it has something to do with sourcemaps becoming exceedingly large - and I'm guessing it may have something to do with what we're doing in gatsby-node.js or cms.js for netlify-cms' admin page - although I'm not sure where to start to begin debugging an issue like this. Any pointers would be greatly appreciated.

gatsby-node.js

const path = require("path");
const fs = require("fs");
const remark = require("remark");
const remarkHTML = require("remark-html");
const fetch = require("node-fetch");
const _ = require("lodash");

const {
    assertResourcesAreValid,
    sortResourcesByDate,
    getFeaturedResources,
} = require("./src/utils/resources-data");

const parseForm = require("./src/utils/parseEloquaForm");
const {
    ELOQUA_COMPANY,
    ELOQUA_USERNAME,
    ELOQUA_PASSWORD,
} = require("./src/config-secure");
let elqBaseUrl;

const MARKDOWN_FIELDS = [
    "overviewContentLeft",
    "overviewContentRight",
    "assetContent",
    "content",
];

function fetchJson(url, options) {
    function checkResponse(res) {
        return new Promise(resolve => {
            if (res.ok) {
                resolve(res);
            } else {
                throw Error(`Request rejected with status ${res.status}`);
            }
        });
    }

    function getJson(res) {
        return new Promise(resolve => {
            resolve(res.json());
        });
    }

    return fetch(url, options)
        .then(res => checkResponse(res))
        .then(res => getJson(res));
}

function fetchEloqua(url) {
    const base64 = new Buffer(
        `${ELOQUA_COMPANY}\\${ELOQUA_USERNAME}:${ELOQUA_PASSWORD}`
    ).toString("base64");
    const auth = `Basic ${base64}`;

    return fetchJson(url, { headers: { Authorization: auth } });
}

function getElqBaseUrl() {
    return new Promise(resolve => {
        if (elqBaseUrl) {
            resolve(elqBaseUrl);
        } else {
            return fetchEloqua("https://login.eloqua.com/id").then(
                ({ urls }) => {
                    const baseUrl = urls.base;
                    elqBaseUrl = baseUrl;
                    resolve(baseUrl);
                }
            );
        }
    });
}

function getElqForm(baseUrl, elqFormId) {
    return fetchEloqua(`${baseUrl}/api/rest/2.0/assets/form/${elqFormId}`);
}

function existsPromise(path) {
    return new Promise((resolve, reject) => {
        return fs.exists(path, (exists, err) =>
            err ? reject(err) : resolve(exists)
        );
    });
}

function mkdirPromise(path) {
    return new Promise((resolve, reject) => {
        return fs.mkdir(path, err => (err ? reject(err) : resolve()));
    });
}

function writeFilePromise(path, data) {
    return new Promise((resolve, reject) => {
        return fs.writeFile(path, data, err => (err ? reject(err) : resolve()));
    });
}

exports.onPreBootstrap = () => {
    // Cache the eloqua base URL used to make Eloqua requests
    return new Promise(resolve => {
        getElqBaseUrl().then(() => {
            resolve();
        });
    });
};

exports.onCreateWebpackConfig = ({ stage, actions, plugins, loaders }) => {
    let config = {
        resolve: {
            modules: [path.resolve(__dirname, "src"), "node_modules"],
        },
        plugins: [
            plugins.provide({
                // exposes jquery as global for the Swiftype vendor library
                jQuery: "jquery",
                // ideally we should eventually remove these and instead use
                // explicit imports within files to take advantage of
                // treeshaking-friendly lodash imports
                $: "jquery",
                _: "lodash",
            }),
            plugins.define({
                CMS_PREVIEW: false,
            }),
        ],
    };

    if (stage === "build-html") {
        config = {
            ...config,
            module: {
                rules: [
                    {
                        // ignore these modules which rely on the window global on build phase
                        test: /jquery|js-cookie|query-string|tabbable/,
                        use: loaders.null(),
                    },
                ],
            },
        };
    }

    actions.setWebpackConfig(config);
};

exports.onCreateNode = ({ node, actions }) => {
    const { createNode, createNodeField } = actions;
    const { elqFormId, happyHour, resourcesData } = node;
    const forms = [];

    if (resourcesData) {
        assertResourcesAreValid(resourcesData);

        const sortedResources = sortResourcesByDate(resourcesData);
        const featuredResources = getFeaturedResources(resourcesData);

        createNodeField({
            name: "sortedResourcesByDate",
            node,
            value: sortedResources,
        });

        createNodeField({
            name: "featuredResources",
            node,
            value: featuredResources,
        });
    }

    // Convert markdown-formatted fields to HTML
    MARKDOWN_FIELDS.forEach(field => {
        const fieldValue = node[field];

        if (fieldValue) {
            const html = remark()
                .use(remarkHTML)
                .processSync(fieldValue)
                .toString();

            createNodeField({
                node,
                name: field,
                value: html,
            });
        }
    });

    function createFormFieldsNode({ elqFormId, nodeFieldName }) {
        return getElqBaseUrl()
            .then(baseUrl => getElqForm(baseUrl, elqFormId))
            .then(form => {
                createNodeField({
                    node,
                    name: nodeFieldName,
                    value: parseForm(form),
                });
                return Promise.resolve();
            })
            .catch(err => {
                throw `Eloqua Form ID ${elqFormId} - ${err}`;
            });
    }

    // Fetch main Eloqua form and attach to node referencing elqFormId
    if (elqFormId) {
        const mainForm = createFormFieldsNode({
            elqFormId,
            nodeFieldName: "formFields",
        });

        forms.push(mainForm);
    }

    // The main event landing page has two forms, the main form and a happy hour
    // form. This gets the happy hour form.
    if (happyHour && happyHour.elqFormId) {
        const happyHourForm = createFormFieldsNode({
            elqFormId: happyHour.elqFormId,
            nodeFieldName: "happyHourFormFields",
        });

        forms.push(happyHourForm);
    }

    return Promise.all(forms);
};

exports.onCreatePage = ({ page, actions }) => {
    const { createPage, deletePage } = actions;

    // Pass the page path to context so it's available in page queries as
    // GraphQL variables
    return new Promise(resolve => {
        const oldPage = Object.assign({}, page);
        deletePage(oldPage);
        createPage({
            ...oldPage,
            context: {
                slug: oldPage.path,
            },
        });
        resolve();
    });
};

exports.createPages = ({ graphql, actions }) => {
    const dir = path.resolve("static/compiled");
    const file = path.join(dir, "blocked-email-domains.json");
    const lpStandardTemplate = path.resolve("src/templates/lp-standard.js");
    const lpEbookTemplate = path.resolve("src/templates/lp-ebook.js");
    const lpWebinarSeriesTemplate = path.resolve(
        "src/templates/lp-webinar-series.js"
    );
    const lpThankYouTemplate = path.resolve("src/templates/lp-thank-you.js");
    const lpEventMainTemplate = path.resolve("src/templates/lp-event-main.js");
    const lpEventHappyHourTemplate = path.resolve(
        "src/templates/lp-event-happy-hour.js"
    );
    const lpEventActivityTemplate = path.resolve(
        "src/templates/lp-event-activity.js"
    );
    const lpEventRoadshowTemplate = path.resolve(
        "src/templates/lp-event-roadshow.js"
    );
    const { createPage } = actions;

    return graphql(`
        {
            // a bunch of graphQL queries
       }
    `).then(result => {
        if (result.errors) {
            throw result.errors;
        }

        // Create pages from the data files generated by the CMS
        result.data.allLpStandardYaml.edges.forEach(({ node }) => {
            createPage({
                path: `resources/${node.slug}`,
                component: lpStandardTemplate,
                context: {
                    ...node,
                },
            });
        });

        result.data.allLpThankYouYaml.edges.forEach(({ node }) => {
            createPage({
                path: `resources/${node.slug}`,
                component: lpThankYouTemplate,
                context: {
                    ...node,
                },
            });
        });

        result.data.allLpEbookYaml.edges.forEach(({ node }) => {
            createPage({
                path: `resources/${node.slug}`,
                component: lpEbookTemplate,
                context: {
                    ...node,
                },
            });
        });

        result.data.allLpWebinarSeriesYaml.edges.forEach(({ node }) => {
            createPage({
                path: `resources/${node.slug}`,
                component: lpWebinarSeriesTemplate,
                context: {
                    ...node,
                },
            });
        });

        result.data.allLpEventMainYaml.edges.forEach(({ node }) => {
            createPage({
                path: `events/${node.slug}`,
                component: lpEventMainTemplate,
                context: {
                    ...node,
                },
            });
        });

        result.data.allLpEventHappyHourYaml.edges.forEach(({ node }) => {
            createPage({
                path: `events/${node.slug}`,
                component: lpEventHappyHourTemplate,
                context: {
                    ...node,
                },
            });
        });

        result.data.allLpEventActivityYaml.edges.forEach(({ node }) => {
            createPage({
                path: `events/${node.slug}`,
                component: lpEventActivityTemplate,
                context: {
                    ...node,
                },
            });
        });

        result.data.allLpEventRoadshowYaml.edges.forEach(({ node }) => {
            createPage({
                path: `events/${node.slug}`,
                component: lpEventRoadshowTemplate,
                context: {
                    ...node,
                },
            });
        });

        // Build copy of blocked-email-domains.yml as JSON in /static
        // This is referenced by the Eloqua-hosted forms on go.memsql.com
        const { blockedEmailDomains } = result.data.miscYaml;
        const domainsArray = blockedEmailDomains
            .trim()
            .split("\n")
            .map(rule => rule.toLowerCase());

        return existsPromise(dir)
            .then(exists => (exists ? Promise.resolve() : mkdirPromise(dir)))
            .then(() => writeFilePromise(file, JSON.stringify(domainsArray)));
    });
};

package.json

{
   ...,
    "browserslist": [
        ">0.25%",
        "not dead"
    ],
    "devDependencies": {
        "@babel/core": "7.1.5",
        "@babel/plugin-syntax-dynamic-import": "7.2.0",
        "@storybook/addon-knobs": "5.0.11",
        "@storybook/addon-storysource": "5.0.11",
        "babel-eslint": "8.2.2",
        "babel-loader": "8.0.4",
        "eslint": "4.12.1",
        "eslint-plugin-babel": "4.1.2",
        "eslint-plugin-flowtype": "2.39.1",
        "eslint-plugin-import": "2.8.0",
        "eslint-plugin-prettier": "2.3.1",
        "eslint-plugin-react": "7.5.1",
        "file-loader": "2.0.0",
        "gatsby": "2.8.8",
        "gatsby-link": "2.1.1",
        "gatsby-plugin-intercom-spa": "0.1.0",
        "gatsby-plugin-netlify-cms": "vai0/gatsby-plugin-netlify-cms#918821c",
        "gatsby-plugin-polyfill-io": "1.1.0",
        "gatsby-plugin-react-helmet": "3.0.12",
        "gatsby-plugin-root-import": "2.0.5",
        "gatsby-plugin-sass": "2.1.0",
        "gatsby-plugin-sentry": "1.0.1",
        "gatsby-plugin-sitemap": "2.1.0",
        "gatsby-source-apiserver": "2.1.2",
        "gatsby-source-filesystem": "2.0.39",
        "gatsby-transformer-json": "2.1.11",
        "gatsby-transformer-yaml": "2.1.12",
        "html-webpack-plugin": "3.2.0",
        "node-fetch": "2.3.0",
        "node-sass": "4.12.0",
        "react-lorem-component": "0.13.0",
        "remark": "10.0.1",
        "remark-html": "9.0.0",
        "uglify-js": "3.3.28",
        "uglifyjs-folder": "1.5.1",
        "yup": "0.24.1"
    },
    "dependencies": {
        "@fortawesome/fontawesome-pro": "5.6.1",
        "@fortawesome/fontawesome-svg-core": "1.2.6",
        "@fortawesome/free-brands-svg-icons": "5.5.0",
        "@fortawesome/pro-regular-svg-icons": "5.4.1",
        "@fortawesome/pro-solid-svg-icons": "5.4.1",
        "@fortawesome/react-fontawesome": "0.1.3",
        "@storybook/addon-a11y": "5.0.11",
        "@storybook/addon-viewport": "5.0.11",
        "@storybook/addons": "5.0.11",
        "@storybook/cli": "5.0.11",
        "@storybook/react": "5.0.11",
        "anchorate": "1.2.3",
        "autoprefixer": "8.3.0",
        "autosuggest-highlight": "3.1.1",
        "balance-text": "3.3.0",
        "classnames": "2.2.5",
        "flubber": "0.4.2",
        "focus-trap-react": "4.0.0",
        "formik": "vai0/formik#d524e4c",
        "google-map-react": "1.1.2",
        "jquery": "3.3.1",
        "js-cookie": "2.2.0",
        "lodash": "4.17.11",
        "minisearch": "2.0.0",
        "moment": "2.22.0",
        "moment-timezone": "0.5.23",
        "netlify-cms": "2.9.0",
        "prop-types": "15.6.2",
        "query-string": "5.1.1",
        "react": "16.6.1",
        "react-add-to-calendar-hoc": "1.0.8",
        "react-anchor-link-smooth-scroll": "1.0.12",
        "react-autosuggest": "9.4.3",
        "react-dom": "16.6.1",
        "react-helmet": "5.2.0",
        "react-player": "1.7.0",
        "react-redux": "6.0.0",
        "react-remove-scroll-bar": "1.2.0",
        "react-select": "1.2.1",
        "react-slick": "0.24.0",
        "react-spring": "6.1.8",
        "react-truncate": "2.4.0",
        "react-typekit": "1.1.3",
        "react-waypoint": "8.0.3",
        "react-youtube": "7.6.0",
        "redux": "4.0.1",
        "slick-carousel": "1.8.1",
        "typeface-inconsolata": "0.0.54",
        "typeface-lato": "0.0.54",
        "whatwg-fetch": "2.0.4",
        "xr": "0.3.0"
    }
}

cms.js

import CMS from "netlify-cms";

import "typeface-lato";
import "typeface-inconsolata";
import "scss/global.scss";

import StandardLandingPagePreview from "cms/preview-templates/StandardLandingPagePreview";
import StandardThankYouPagePreview from "cms/preview-templates/StandardThankYouPagePreview";
import EbookLandingPagePreview from "cms/preview-templates/EbookLandingPagePreview";
import WebinarSeriesLandingPagePreview from "cms/preview-templates/WebinarSeriesLandingPagePreview";
import EventMainLandingPagePreview from "cms/preview-templates/EventMainLandingPagePreview";
import EventHappyHourLandingPagePreview from "cms/preview-templates/EventHappyHourLandingPagePreview";
import EventActivityLandingPagePreview from "cms/preview-templates/EventActivityLandingPagePreview";
import EventRoadshowLandingPagePreview from "cms/preview-templates/EventRoadshowLandingPagePreview";

// The following window and global config settings below were taken from here.
// https://github.com/gatsbyjs/gatsby/blob/master/docs/docs/visual-testing-with-storybook.md
// They're required because the netlify-cms runs on a separate webpack config,
// and outside of Gatsby. This ensures any Gatsby components imported into the
// CMS works without errors

// highlight-start
// Gatsby's Link overrides:
// Gatsby defines a global called ___loader to prevent its method calls from creating console errors you override it here
global.___loader = {
    enqueue: () => {},
    hovering: () => {},
};

// Gatsby internal mocking to prevent unnecessary errors
global.__PATH_PREFIX__ = "";

// This is to utilized to override the window.___navigate method Gatsby defines and uses to report what path a Link would be taking us to
window.___navigate = pathname => {
    alert(`This would navigate to: https://www.memsql.com${pathname}`);
};

CMS.registerPreviewTemplate("lp-standard", StandardLandingPagePreview);
CMS.registerPreviewTemplate("lp-ebook", EbookLandingPagePreview);
CMS.registerPreviewTemplate(
    "lp-webinar-series",
    WebinarSeriesLandingPagePreview
);
CMS.registerPreviewTemplate("content", StandardLandingPagePreview);
CMS.registerPreviewTemplate("content-syndication", StandardLandingPagePreview);
CMS.registerPreviewTemplate("programmatic", StandardLandingPagePreview);
CMS.registerPreviewTemplate("sponsored-webcast", StandardLandingPagePreview);
CMS.registerPreviewTemplate("webcast", StandardLandingPagePreview);
CMS.registerPreviewTemplate("web-forms", StandardLandingPagePreview);
CMS.registerPreviewTemplate("other", StandardLandingPagePreview);
CMS.registerPreviewTemplate("lp-thank-you", StandardThankYouPagePreview);
CMS.registerPreviewTemplate("lp-event-main", EventMainLandingPagePreview);
CMS.registerPreviewTemplate(
    "lp-event-happy-hour",
    EventHappyHourLandingPagePreview
);
CMS.registerPreviewTemplate(
    "lp-event-activity",
    EventActivityLandingPagePreview
);
CMS.registerPreviewTemplate(
    "lp-event-roadshow",
    EventRoadshowLandingPagePreview
);

Environment

  System:
    OS: Linux 4.19 Debian GNU/Linux 9 (stretch) 9 (stretch)
    CPU: (8) x64 Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
    Shell: 4.4.23 - /nix/store/mcyvp1s45scjkkhyb1m16aqlsb8wr6hs-bash-interactive-4.4-p23/bin/bash
  Binaries:
    Node: 10.15.3 - /nix/store/47wbs3fgygg6i7za4knbcqpmrwlckqy4-bifrost-env/bin/node
    npm: 6.4.1 - /nix/store/47wbs3fgygg6i7za4knbcqpmrwlckqy4-bifrost-env/bin/npm
  Languages:
    Python: 3.6.8 - /home/jchi/Projects/bifrost/backend/venv/bin/python
  Browsers:
    Chrome: 73.0.3683.103
    Firefox: 60.7.1
  npmPackages:
    gatsby: 2.8.8 => 2.8.8 
    gatsby-link: 2.1.1 => 2.1.1 
    gatsby-plugin-intercom-spa: 0.1.0 => 0.1.0 
    gatsby-plugin-netlify-cms: vai0/gatsby-plugin-netlify-cms#918821c => 3.0.9 
    gatsby-plugin-polyfill-io: 1.1.0 => 1.1.0 
    gatsby-plugin-react-helmet: 3.0.12 => 3.0.12 
    gatsby-plugin-root-import: 2.0.5 => 2.0.5 
    gatsby-plugin-sass: 2.1.0 => 2.1.0 
    gatsby-plugin-sentry: 1.0.1 => 1.0.1 
    gatsby-plugin-sitemap: 2.1.0 => 2.1.0 
    gatsby-source-apiserver: 2.1.2 => 2.1.2 
    gatsby-source-filesystem: 2.0.39 => 2.0.39 
    gatsby-transformer-json: 2.1.11 => 2.1.11 
    gatsby-transformer-yaml: 2.1.12 => 2.1.12 
n8tb1t commented 5 years ago

I'm having the same issue on 8 core i7 with 64gb ram and SSD! But I'm using only generated pages and mdx content on a very small site. So, no external sources of any content. After a couple of hot reloads each reload is taking more and more time.

davidgomes commented 5 years ago

While working on the same project as @vai0, I also often get this error:

ℹ 「wdm」: Compiling...

———————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————
221 pages                                                                                                                                                           

<--- Last few GCs --->

[31514:0x36cc760]   259984 ms: Mark-sweep 1280.7 (1417.2) -> 1280.7 (1379.7) MB, 1635.9 / 0.1 ms  (average mu = 0.808, current mu = 0.000) last resort GC in old space requested                                                                                                                                                                     
[31514:0x36cc760]   261289 ms: Mark-sweep 1280.7 (1379.7) -> 1280.7 (1373.7) MB, 1304.2 / 0.1 ms  (average mu = 0.695, current mu = 0.000) last resort GC in old space requested                                                                                                                                                                     

<--- JS stacktrace --->

==== JS stack trace =========================================

    0: ExitFrame [pc: 0x2dfb3695be1d]
Security context: 0x0d4ec729e6e9 <JSObject>
    1: byteLength(aka byteLength) [0x2cce61f92b39] [buffer.js:531] [bytecode=0x3ca65df7e411 offset=204](this=0x3ae4255826f1 <undefined>,string=0x0e77b27e1b59 <Very long string[36807366]>,encoding=0x0d4ec72bdd99 <String[4]: utf8>)                                                                                                                
    2: arguments adaptor frame: 3->2
    3: fromString(aka fromString) [0x2cce61fa03a9] [buffer.js:342] [bytecode=0x3ca65df78611 o...

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory
 1: 0x8e8c18 node::Abort() [node]
 2: 0x8e8c61  [node]
 3: 0xac0a02 v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [node]
 4: 0xac0d58 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [node]
 5: 0xe97ad2  [node]
 6: 0xeaaa3b v8::internal::Heap::AllocateRawWithRetryOrFail(int, v8::internal::AllocationSpace, v8::internal::AllocationAlignment) [node]
 7: 0xe751a6 v8::internal::Factory::AllocateRawWithImmortalMap(int, v8::internal::PretenureFlag, v8::internal::Map*, v8::internal::AllocationAlignment) [node]
 8: 0xe7c32f v8::internal::Factory::NewRawTwoByteString(int, v8::internal::PretenureFlag) [node]
 9: 0xfbd44c v8::internal::String::SlowFlatten(v8::internal::Handle<v8::internal::ConsString>, v8::internal::PretenureFlag) [node]
10: 0xacab00 v8::String::Utf8Length() const [node]
11: 0x904e84  [node]
12: 0xb4340f  [node]
13: 0xb4438c v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**, v8::internal::Isolate*) [node]
14: 0x2dfb3695be1d
wardpeet commented 5 years ago

Could you upgrade gatsby-plugin-netlify-cms to version 4.x and netlify-cms-app instead of netlify-cms? This issue should be resolved.

vai0 commented 5 years ago

@wardpeet we are currently running on a forked version of version 4.1.6 and the issue persists: https://github.com/vai0/gatsby-plugin-netlify-cms

vai0 commented 5 years ago

Here is a profile of the HMR - making a change, saving, undoing that change, then saving again. The compile time for this was around 1300ms for each change. Note this is with us setting sourcemaps in development to eval - the cheaper option.

Anyone see anything that we can do to improve this time? It appears graphql is recompiling our queries even though our change is literally updating text.

Here's the performance profile result using Chrome Devtools.

wardpeet commented 5 years ago

@vai0 can you tell me what version of gatsby you're running? Seems to be 2.8.8, we might have fixed some issues. This might not be the case but i've seen some source-map issues in the past.

Any chance we can have a look at your repo to resolve this? Feel free to DM me or send me a mail to ward@gatsbyjs.com

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